2007-07-04 08:24:30 +00:00
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//
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// deadline_timer_service.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2007 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP
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#define ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/push_options.hpp"
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#include "asio/detail/push_options.hpp"
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#include <cstddef>
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#include <boost/config.hpp>
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#include <boost/date_time/posix_time/posix_time_types.hpp>
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#include "asio/detail/pop_options.hpp"
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#include "asio/error.hpp"
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#include "asio/io_service.hpp"
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#include "asio/detail/bind_handler.hpp"
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#include "asio/detail/noncopyable.hpp"
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#include "asio/detail/service_base.hpp"
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#include "asio/detail/socket_ops.hpp"
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#include "asio/detail/socket_types.hpp"
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#include "asio/detail/timer_queue.hpp"
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namespace asio {
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namespace detail {
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template <typename Time_Traits, typename Timer_Scheduler>
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class deadline_timer_service
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: public asio::detail::service_base<
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deadline_timer_service<Time_Traits, Timer_Scheduler> >
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{
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public:
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// The time type.
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typedef typename Time_Traits::time_type time_type;
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// The duration type.
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typedef typename Time_Traits::duration_type duration_type;
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// The implementation type of the timer. This type is dependent on the
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// underlying implementation of the timer service.
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struct implementation_type
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: private asio::detail::noncopyable
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{
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time_type expiry;
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bool might_have_pending_waits;
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};
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// Constructor.
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deadline_timer_service(asio::io_service& io_service)
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: asio::detail::service_base<
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deadline_timer_service<Time_Traits, Timer_Scheduler> >(io_service),
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scheduler_(asio::use_service<Timer_Scheduler>(io_service))
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{
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scheduler_.add_timer_queue(timer_queue_);
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}
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// Destructor.
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~deadline_timer_service()
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{
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scheduler_.remove_timer_queue(timer_queue_);
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}
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// Destroy all user-defined handler objects owned by the service.
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void shutdown_service()
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{
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}
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// Construct a new timer implementation.
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void construct(implementation_type& impl)
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{
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impl.expiry = time_type();
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impl.might_have_pending_waits = false;
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}
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// Destroy a timer implementation.
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void destroy(implementation_type& impl)
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{
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asio::error_code ec;
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cancel(impl, ec);
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}
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// Cancel any asynchronous wait operations associated with the timer.
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std::size_t cancel(implementation_type& impl, asio::error_code& ec)
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{
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if (!impl.might_have_pending_waits)
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{
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ec = asio::error_code();
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return 0;
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}
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std::size_t count = scheduler_.cancel_timer(timer_queue_, &impl);
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impl.might_have_pending_waits = false;
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ec = asio::error_code();
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return count;
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}
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// Get the expiry time for the timer as an absolute time.
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time_type expires_at(const implementation_type& impl) const
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{
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return impl.expiry;
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}
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// Set the expiry time for the timer as an absolute time.
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std::size_t expires_at(implementation_type& impl,
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const time_type& expiry_time, asio::error_code& ec)
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{
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std::size_t count = cancel(impl, ec);
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impl.expiry = expiry_time;
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ec = asio::error_code();
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return count;
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}
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// Get the expiry time for the timer relative to now.
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duration_type expires_from_now(const implementation_type& impl) const
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{
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return Time_Traits::subtract(expires_at(impl), Time_Traits::now());
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}
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// Set the expiry time for the timer relative to now.
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std::size_t expires_from_now(implementation_type& impl,
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const duration_type& expiry_time, asio::error_code& ec)
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{
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return expires_at(impl,
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Time_Traits::add(Time_Traits::now(), expiry_time), ec);
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}
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// Perform a blocking wait on the timer.
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void wait(implementation_type& impl, asio::error_code& ec)
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{
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time_type now = Time_Traits::now();
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while (Time_Traits::less_than(now, impl.expiry))
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{
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boost::posix_time::time_duration timeout =
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Time_Traits::to_posix_duration(Time_Traits::subtract(impl.expiry, now));
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::timeval tv;
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tv.tv_sec = timeout.total_seconds();
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tv.tv_usec = timeout.total_microseconds() % 1000000;
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asio::error_code ec;
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socket_ops::select(0, 0, 0, 0, &tv, ec);
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now = Time_Traits::now();
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}
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ec = asio::error_code();
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}
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template <typename Handler>
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class wait_handler
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{
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public:
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wait_handler(asio::io_service& io_service, Handler handler)
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: io_service_(io_service),
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work_(io_service),
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handler_(handler)
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{
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}
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void operator()(const asio::error_code& result)
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{
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io_service_.post(detail::bind_handler(handler_, result));
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}
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private:
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asio::io_service& io_service_;
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asio::io_service::work work_;
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Handler handler_;
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};
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// Start an asynchronous wait on the timer.
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template <typename Handler>
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void async_wait(implementation_type& impl, Handler handler)
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{
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impl.might_have_pending_waits = true;
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scheduler_.schedule_timer(timer_queue_, impl.expiry,
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2007-11-23 23:36:34 +00:00
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wait_handler<Handler>(this->get_io_service(), handler), &impl);
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2007-07-04 08:24:30 +00:00
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}
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private:
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// The queue of timers.
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timer_queue<Time_Traits> timer_queue_;
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// The object that schedules and executes timers. Usually a reactor.
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Timer_Scheduler& scheduler_;
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP
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