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//
// deadline_timer_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_DETAIL_DEADLINE_TIMER_SERVICE_HPP
#define BOOST_ASIO_DETAIL_DEADLINE_TIMER_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 <boost/config.hpp>
#include <boost/date_time/posix_time/posix_time_types.hpp>
#include <boost/asio/detail/pop_options.hpp>
#include <boost/asio/error.hpp>
#include <boost/asio/io_service.hpp>
#include <boost/asio/detail/bind_handler.hpp>
#include <boost/asio/detail/handler_base_from_member.hpp>
#include <boost/asio/detail/noncopyable.hpp>
#include <boost/asio/detail/service_base.hpp>
#include <boost/asio/detail/socket_ops.hpp>
#include <boost/asio/detail/socket_types.hpp>
#include <boost/asio/detail/timer_queue.hpp>
namespace boost {
namespace asio {
namespace detail {
template <typename Time_Traits, typename Timer_Scheduler>
class deadline_timer_service
: public boost::asio::detail::service_base<
deadline_timer_service<Time_Traits, Timer_Scheduler> >
{
public:
// The time type.
typedef typename Time_Traits::time_type time_type;
// The duration type.
typedef typename Time_Traits::duration_type duration_type;
// The implementation type of the timer. This type is dependent on the
// underlying implementation of the timer service.
struct implementation_type
: private boost::asio::detail::noncopyable
{
time_type expiry;
bool might_have_pending_waits;
};
// Constructor.
deadline_timer_service(boost::asio::io_service& io_service)
: boost::asio::detail::service_base<
deadline_timer_service<Time_Traits, Timer_Scheduler> >(io_service),
scheduler_(boost::asio::use_service<Timer_Scheduler>(io_service))
{
scheduler_.init_task();
scheduler_.add_timer_queue(timer_queue_);
}
// Destructor.
~deadline_timer_service()
{
scheduler_.remove_timer_queue(timer_queue_);
}
// Destroy all user-defined handler objects owned by the service.
void shutdown_service()
{
}
// Construct a new timer implementation.
void construct(implementation_type& impl)
{
impl.expiry = time_type();
impl.might_have_pending_waits = false;
}
// Destroy a timer implementation.
void destroy(implementation_type& impl)
{
boost::system::error_code ec;
cancel(impl, ec);
}
// Cancel any asynchronous wait operations associated with the timer.
std::size_t cancel(implementation_type& impl, boost::system::error_code& ec)
{
if (!impl.might_have_pending_waits)
{
ec = boost::system::error_code();
return 0;
}
std::size_t count = scheduler_.cancel_timer(timer_queue_, &impl);
impl.might_have_pending_waits = false;
ec = boost::system::error_code();
return count;
}
// Get the expiry time for the timer as an absolute time.
time_type expires_at(const implementation_type& impl) const
{
return impl.expiry;
}
// Set the expiry time for the timer as an absolute time.
std::size_t expires_at(implementation_type& impl,
const time_type& expiry_time, boost::system::error_code& ec)
{
std::size_t count = cancel(impl, ec);
impl.expiry = expiry_time;
ec = boost::system::error_code();
return count;
}
// Get the expiry time for the timer relative to now.
duration_type expires_from_now(const implementation_type& impl) const
{
return Time_Traits::subtract(expires_at(impl), Time_Traits::now());
}
// Set the expiry time for the timer relative to now.
std::size_t expires_from_now(implementation_type& impl,
const duration_type& expiry_time, boost::system::error_code& ec)
{
return expires_at(impl,
Time_Traits::add(Time_Traits::now(), expiry_time), ec);
}
// Perform a blocking wait on the timer.
void wait(implementation_type& impl, boost::system::error_code& ec)
{
time_type now = Time_Traits::now();
while (Time_Traits::less_than(now, impl.expiry))
{
boost::posix_time::time_duration timeout =
Time_Traits::to_posix_duration(Time_Traits::subtract(impl.expiry, now));
::timeval tv;
tv.tv_sec = timeout.total_seconds();
tv.tv_usec = timeout.total_microseconds() % 1000000;
boost::system::error_code ec;
socket_ops::select(0, 0, 0, 0, &tv, ec);
now = Time_Traits::now();
}
ec = boost::system::error_code();
}
template <typename Handler>
class wait_handler :
public handler_base_from_member<Handler>
{
public:
wait_handler(boost::asio::io_service& io_service, Handler handler)
: handler_base_from_member<Handler>(handler),
io_service_(io_service),
work_(io_service)
{
}
void operator()(const boost::system::error_code& result)
{
io_service_.post(detail::bind_handler(this->handler_, result));
}
private:
boost::asio::io_service& io_service_;
boost::asio::io_service::work work_;
};
// Start an asynchronous wait on the timer.
template <typename Handler>
void async_wait(implementation_type& impl, Handler handler)
{
impl.might_have_pending_waits = true;
scheduler_.schedule_timer(timer_queue_, impl.expiry,
wait_handler<Handler>(this->get_io_service(), handler), &impl);
}
private:
// The queue of timers.
timer_queue<Time_Traits> timer_queue_;
// The object that schedules and executes timers. Usually a reactor.
Timer_Scheduler& scheduler_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP
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Swift