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+//
+// io_service.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2008 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_IO_SERVICE_HPP
+#define BOOST_ASIO_IO_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/push_options.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+#include <cstddef>
+#include <stdexcept>
+#include <typeinfo>
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/system/error_code.hpp>
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/detail/dev_poll_reactor_fwd.hpp>
+#include <boost/asio/detail/epoll_reactor_fwd.hpp>
+#include <boost/asio/detail/kqueue_reactor_fwd.hpp>
+#include <boost/asio/detail/noncopyable.hpp>
+#include <boost/asio/detail/select_reactor_fwd.hpp>
+#include <boost/asio/detail/service_registry_fwd.hpp>
+#include <boost/asio/detail/signal_init.hpp>
+#include <boost/asio/detail/task_io_service_fwd.hpp>
+#include <boost/asio/detail/win_iocp_io_service_fwd.hpp>
+#include <boost/asio/detail/winsock_init.hpp>
+#include <boost/asio/detail/wrapped_handler.hpp>
+
+namespace boost {
+namespace asio {
+
+class io_service;
+template <typename Service> Service& use_service(io_service& ios);
+template <typename Service> void add_service(io_service& ios, Service* svc);
+template <typename Service> bool has_service(io_service& ios);
+
+/// Provides core I/O functionality.
+/**
+ * The io_service class provides the core I/O functionality for users of the
+ * asynchronous I/O objects, including:
+ *
+ * @li boost::asio::ip::tcp::socket
+ * @li boost::asio::ip::tcp::acceptor
+ * @li boost::asio::ip::udp::socket
+ * @li boost::asio::deadline_timer.
+ *
+ * The io_service class also includes facilities intended for developers of
+ * custom asynchronous services.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Safe, with the exception that calling reset()
+ * while there are unfinished run() calls results in undefined behaviour.
+ *
+ * @par Concepts:
+ * Dispatcher.
+ *
+ * @par Effect of exceptions thrown from handlers
+ *
+ * If an exception is thrown from a handler, the exception is allowed to
+ * propagate through the throwing thread's invocation of
+ * boost::asio::io_service::run(), boost::asio::io_service::run_one(),
+ * boost::asio::io_service::poll() or boost::asio::io_service::poll_one().
+ * No other threads that are calling any of these functions are affected. It is
+ * then the responsibility of the application to catch the exception.
+ *
+ * After the exception has been caught, the
+ * boost::asio::io_service::run(), boost::asio::io_service::run_one(),
+ * boost::asio::io_service::poll() or boost::asio::io_service::poll_one()
+ * call may be restarted @em without the need for an intervening call to
+ * boost::asio::io_service::reset(). This allows the thread to rejoin the
+ * io_service's thread pool without impacting any other threads in the pool.
+ *
+ * For example:
+ *
+ * @code
+ * boost::asio::io_service io_service;
+ * ...
+ * for (;;)
+ * {
+ *   try
+ *   {
+ *     io_service.run();
+ *     break; // run() exited normally
+ *   }
+ *   catch (my_exception& e)
+ *   {
+ *     // Deal with exception as appropriate.
+ *   }
+ * }
+ * @endcode
+ *
+ * @par Stopping the io_service from running out of work
+ *
+ * Some applications may need to prevent an io_service's run() call from
+ * returning when there is no more work to do. For example, the io_service may
+ * be being run in a background thread that is launched prior to the
+ * application's asynchronous operations. The run() call may be kept running by
+ * creating an object of type boost::asio::io_service::work:
+ *
+ * @code boost::asio::io_service io_service;
+ * boost::asio::io_service::work work(io_service);
+ * ... @endcode
+ *
+ * To effect a shutdown, the application will then need to call the io_service's
+ * stop() member function. This will cause the io_service run() call to return
+ * as soon as possible, abandoning unfinished operations and without permitting
+ * ready handlers to be dispatched.
+ *
+ * Alternatively, if the application requires that all operations and handlers
+ * be allowed to finish normally, the work object may be explicitly destroyed.
+ *
+ * @code boost::asio::io_service io_service;
+ * auto_ptr<boost::asio::io_service::work> work(
+ *     new boost::asio::io_service::work(io_service));
+ * ...
+ * work.reset(); // Allow run() to exit. @endcode
+ */
+class io_service
+  : private noncopyable
+{
+private:
+  // The type of the platform-specific implementation.
+#if defined(BOOST_ASIO_HAS_IOCP)
+  typedef detail::win_iocp_io_service impl_type;
+  friend class detail::win_iocp_overlapped_ptr;
+#elif defined(BOOST_ASIO_HAS_EPOLL)
+  typedef detail::task_io_service<detail::epoll_reactor<false> > impl_type;
+#elif defined(BOOST_ASIO_HAS_KQUEUE)
+  typedef detail::task_io_service<detail::kqueue_reactor<false> > impl_type;
+#elif defined(BOOST_ASIO_HAS_DEV_POLL)
+  typedef detail::task_io_service<detail::dev_poll_reactor<false> > impl_type;
+#else
+  typedef detail::task_io_service<detail::select_reactor<false> > impl_type;
+#endif
+
+public:
+  class work;
+  friend class work;
+
+  class id;
+
+  class service;
+
+  class strand;
+
+  /// Constructor.
+  io_service();
+
+  /// Constructor.
+  /**
+   * Construct with a hint about the required level of concurrency.
+   *
+   * @param concurrency_hint A suggestion to the implementation on how many
+   * threads it should allow to run simultaneously.
+   */
+  explicit io_service(std::size_t concurrency_hint);
+
+  /// Destructor.
+  ~io_service();
+
+  /// Run the io_service's event processing loop.
+  /**
+   * The run() function blocks until all work has finished and there are no
+   * more handlers to be dispatched, or until the io_service has been stopped.
+   *
+   * Multiple threads may call the run() function to set up a pool of threads
+   * from which the io_service may execute handlers. All threads that are
+   * waiting in the pool are equivalent and the io_service may choose any one
+   * of them to invoke a handler.
+   *
+   * The run() function may be safely called again once it has completed only
+   * after a call to reset().
+   *
+   * @return The number of handlers that were executed.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   *
+   * @note The poll() function may also be used to dispatch ready handlers,
+   * but without blocking.
+   */
+  std::size_t run();
+
+  /// Run the io_service's event processing loop.
+  /**
+   * The run() function blocks until all work has finished and there are no
+   * more handlers to be dispatched, or until the io_service has been stopped.
+   *
+   * Multiple threads may call the run() function to set up a pool of threads
+   * from which the io_service may execute handlers. All threads that are
+   * waiting in the pool are equivalent and the io_service may choose any one
+   * of them to invoke a handler.
+   *
+   * The run() function may be safely called again once it has completed only
+   * after a call to reset().
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return The number of handlers that were executed.
+   *
+   * @note The poll() function may also be used to dispatch ready handlers,
+   * but without blocking.
+   */
+  std::size_t run(boost::system::error_code& ec);
+
+  /// Run the io_service's event processing loop to execute at most one handler.
+  /**
+   * The run_one() function blocks until one handler has been dispatched, or
+   * until the io_service has been stopped.
+   *
+   * @return The number of handlers that were executed.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  std::size_t run_one();
+
+  /// Run the io_service's event processing loop to execute at most one handler.
+  /**
+   * The run_one() function blocks until one handler has been dispatched, or
+   * until the io_service has been stopped.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return The number of handlers that were executed.
+   */
+  std::size_t run_one(boost::system::error_code& ec);
+
+  /// Run the io_service's event processing loop to execute ready handlers.
+  /**
+   * The poll() function runs handlers that are ready to run, without blocking,
+   * until the io_service has been stopped or there are no more ready handlers.
+   *
+   * @return The number of handlers that were executed.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  std::size_t poll();
+
+  /// Run the io_service's event processing loop to execute ready handlers.
+  /**
+   * The poll() function runs handlers that are ready to run, without blocking,
+   * until the io_service has been stopped or there are no more ready handlers.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return The number of handlers that were executed.
+   */
+  std::size_t poll(boost::system::error_code& ec);
+
+  /// Run the io_service's event processing loop to execute one ready handler.
+  /**
+   * The poll_one() function runs at most one handler that is ready to run,
+   * without blocking.
+   *
+   * @return The number of handlers that were executed.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  std::size_t poll_one();
+
+  /// Run the io_service's event processing loop to execute one ready handler.
+  /**
+   * The poll_one() function runs at most one handler that is ready to run,
+   * without blocking.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @return The number of handlers that were executed.
+   */
+  std::size_t poll_one(boost::system::error_code& ec);
+
+  /// Stop the io_service's event processing loop.
+  /**
+   * This function does not block, but instead simply signals the io_service to
+   * stop. All invocations of its run() or run_one() member functions should
+   * return as soon as possible. Subsequent calls to run(), run_one(), poll()
+   * or poll_one() will return immediately until reset() is called.
+   */
+  void stop();
+
+  /// Reset the io_service in preparation for a subsequent run() invocation.
+  /**
+   * This function must be called prior to any second or later set of
+   * invocations of the run(), run_one(), poll() or poll_one() functions when a
+   * previous invocation of these functions returned due to the io_service
+   * being stopped or running out of work. This function allows the io_service
+   * to reset any internal state, such as a "stopped" flag.
+   *
+   * This function must not be called while there are any unfinished calls to
+   * the run(), run_one(), poll() or poll_one() functions.
+   */
+  void reset();
+
+  /// Request the io_service to invoke the given handler.
+  /**
+   * This function is used to ask the io_service to execute the given handler.
+   *
+   * The io_service guarantees that the handler will only be called in a thread
+   * in which the run(), run_one(), poll() or poll_one() member functions is
+   * currently being invoked. The handler may be executed inside this function
+   * if the guarantee can be met.
+   *
+   * @param handler The handler to be called. The io_service will make
+   * a copy of the handler object as required. The function signature of the
+   * handler must be: @code void handler(); @endcode
+   */
+  template <typename CompletionHandler>
+  void dispatch(CompletionHandler handler);
+
+  /// Request the io_service to invoke the given handler and return immediately.
+  /**
+   * This function is used to ask the io_service to execute the given handler,
+   * but without allowing the io_service to call the handler from inside this
+   * function.
+   *
+   * The io_service guarantees that the handler will only be called in a thread
+   * in which the run(), run_one(), poll() or poll_one() member functions is
+   * currently being invoked.
+   *
+   * @param handler The handler to be called. The io_service will make
+   * a copy of the handler object as required. The function signature of the
+   * handler must be: @code void handler(); @endcode
+   */
+  template <typename CompletionHandler>
+  void post(CompletionHandler handler);
+
+  /// Create a new handler that automatically dispatches the wrapped handler
+  /// on the io_service.
+  /**
+   * This function is used to create a new handler function object that, when
+   * invoked, will automatically pass the wrapped handler to the io_service's
+   * dispatch function.
+   *
+   * @param handler The handler to be wrapped. The io_service will make a copy
+   * of the handler object as required. The function signature of the handler
+   * must be: @code void handler(A1 a1, ... An an); @endcode
+   *
+   * @return A function object that, when invoked, passes the wrapped handler to
+   * the io_service's dispatch function. Given a function object with the
+   * signature:
+   * @code R f(A1 a1, ... An an); @endcode
+   * If this function object is passed to the wrap function like so:
+   * @code io_service.wrap(f); @endcode
+   * then the return value is a function object with the signature
+   * @code void g(A1 a1, ... An an); @endcode
+   * that, when invoked, executes code equivalent to:
+   * @code io_service.dispatch(boost::bind(f, a1, ... an)); @endcode
+   */
+  template <typename Handler>
+#if defined(GENERATING_DOCUMENTATION)
+  unspecified
+#else
+  detail::wrapped_handler<io_service&, Handler>
+#endif
+  wrap(Handler handler);
+
+  /// Obtain the service object corresponding to the given type.
+  /**
+   * This function is used to locate a service object that corresponds to
+   * the given service type. If there is no existing implementation of the
+   * service, then the io_service will create a new instance of the service.
+   *
+   * @param ios The io_service object that owns the service.
+   *
+   * @return The service interface implementing the specified service type.
+   * Ownership of the service interface is not transferred to the caller.
+   */
+  template <typename Service>
+  friend Service& use_service(io_service& ios);
+
+  /// Add a service object to the io_service.
+  /**
+   * This function is used to add a service to the io_service.
+   *
+   * @param ios The io_service object that owns the service.
+   *
+   * @param svc The service object. On success, ownership of the service object
+   * is transferred to the io_service. When the io_service object is destroyed,
+   * it will destroy the service object by performing:
+   * @code delete static_cast<io_service::service*>(svc) @endcode
+   *
+   * @throws boost::asio::service_already_exists Thrown if a service of the
+   * given type is already present in the io_service.
+   *
+   * @throws boost::asio::invalid_service_owner Thrown if the service's owning
+   * io_service is not the io_service object specified by the ios parameter.
+   */
+  template <typename Service>
+  friend void add_service(io_service& ios, Service* svc);
+
+  /// Determine if an io_service contains a specified service type.
+  /**
+   * This function is used to determine whether the io_service contains a
+   * service object corresponding to the given service type.
+   *
+   * @param ios The io_service object that owns the service.
+   *
+   * @return A boolean indicating whether the io_service contains the service.
+   */
+  template <typename Service>
+  friend bool has_service(io_service& ios);
+
+private:
+#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
+  detail::winsock_init<> init_;
+#elif defined(__sun) || defined(__QNX__) || defined(__hpux) || defined(_AIX) \
+  || defined(__osf__)
+  detail::signal_init<> init_;
+#endif
+
+  // The service registry.
+  boost::asio::detail::service_registry* service_registry_;
+
+  // The implementation.
+  impl_type& impl_;
+};
+
+/// Class to inform the io_service when it has work to do.
+/**
+ * The work class is used to inform the io_service when work starts and
+ * finishes. This ensures that the io_service's run() function will not exit
+ * while work is underway, and that it does exit when there is no unfinished
+ * work remaining.
+ *
+ * The work class is copy-constructible so that it may be used as a data member
+ * in a handler class. It is not assignable.
+ */
+class io_service::work
+{
+public:
+  /// Constructor notifies the io_service that work is starting.
+  /**
+   * The constructor is used to inform the io_service that some work has begun.
+   * This ensures that the io_service's run() function will not exit while the
+   * work is underway.
+   */
+  explicit work(boost::asio::io_service& io_service);
+
+  /// Copy constructor notifies the io_service that work is starting.
+  /**
+   * The constructor is used to inform the io_service that some work has begun.
+   * This ensures that the io_service's run() function will not exit while the
+   * work is underway.
+   */
+  work(const work& other);
+
+  /// Destructor notifies the io_service that the work is complete.
+  /**
+   * The destructor is used to inform the io_service that some work has
+   * finished. Once the count of unfinished work reaches zero, the io_service's
+   * run() function is permitted to exit.
+   */
+  ~work();
+
+  /// (Deprecated: use get_io_service().) Get the io_service associated with the
+  /// work.
+  boost::asio::io_service& io_service();
+
+  /// Get the io_service associated with the work.
+  boost::asio::io_service& get_io_service();
+
+private:
+  // Prevent assignment.
+  void operator=(const work& other);
+
+  // The io_service.
+  boost::asio::io_service& io_service_;
+};
+
+/// Class used to uniquely identify a service.
+class io_service::id
+  : private noncopyable
+{
+public:
+  /// Constructor.
+  id() {}
+};
+
+/// Base class for all io_service services.
+class io_service::service
+  : private noncopyable
+{
+public:
+  /// (Deprecated: use get_io_service().) Get the io_service object that owns
+  /// the service.
+  boost::asio::io_service& io_service();
+
+  /// Get the io_service object that owns the service.
+  boost::asio::io_service& get_io_service();
+
+protected:
+  /// Constructor.
+  /**
+   * @param owner The io_service object that owns the service.
+   */
+  service(boost::asio::io_service& owner);
+
+  /// Destructor.
+  virtual ~service();
+
+private:
+  /// Destroy all user-defined handler objects owned by the service.
+  virtual void shutdown_service() = 0;
+
+  friend class boost::asio::detail::service_registry;
+  boost::asio::io_service& owner_;
+  const std::type_info* type_info_;
+  const boost::asio::io_service::id* id_;
+  service* next_;
+};
+
+/// Exception thrown when trying to add a duplicate service to an io_service.
+class service_already_exists
+  : public std::logic_error
+{
+public:
+  service_already_exists()
+    : std::logic_error("Service already exists.")
+  {
+  }
+};
+
+/// Exception thrown when trying to add a service object to an io_service where
+/// the service has a different owner.
+class invalid_service_owner
+  : public std::logic_error
+{
+public:
+  invalid_service_owner()
+    : std::logic_error("Invalid service owner.")
+  {
+  }
+};
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/impl/io_service.ipp>
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_IO_SERVICE_HPP