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authorMatthias P. Braendli <matthias.braendli@mpb.li>2019-10-07 04:52:50 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2019-10-07 04:52:50 +0200
commit0aa6201a490bfabc0ae021ceb9f1fb0f46727c5d (patch)
treea71d934d8151dd43e7c16555fef17fd749c5da70 /lib/asio/detail/deadline_timer_service.hpp
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-//
-// detail/deadline_timer_service.hpp
-// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 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 ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP
-#define ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include <cstddef>
-#include "asio/error.hpp"
-#include "asio/io_context.hpp"
-#include "asio/detail/bind_handler.hpp"
-#include "asio/detail/fenced_block.hpp"
-#include "asio/detail/memory.hpp"
-#include "asio/detail/noncopyable.hpp"
-#include "asio/detail/socket_ops.hpp"
-#include "asio/detail/socket_types.hpp"
-#include "asio/detail/timer_queue.hpp"
-#include "asio/detail/timer_queue_ptime.hpp"
-#include "asio/detail/timer_scheduler.hpp"
-#include "asio/detail/wait_handler.hpp"
-#include "asio/detail/wait_op.hpp"
-
-#if defined(ASIO_WINDOWS_RUNTIME)
-# include <chrono>
-# include <thread>
-#endif // defined(ASIO_WINDOWS_RUNTIME)
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace detail {
-
-template <typename Time_Traits>
-class deadline_timer_service
- : public service_base<deadline_timer_service<Time_Traits> >
-{
-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 asio::detail::noncopyable
- {
- time_type expiry;
- bool might_have_pending_waits;
- typename timer_queue<Time_Traits>::per_timer_data timer_data;
- };
-
- // Constructor.
- deadline_timer_service(asio::io_context& io_context)
- : service_base<deadline_timer_service<Time_Traits> >(io_context),
- scheduler_(asio::use_service<timer_scheduler>(io_context))
- {
- 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()
- {
- }
-
- // 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)
- {
- asio::error_code ec;
- cancel(impl, ec);
- }
-
- // Move-construct a new serial port implementation.
- void move_construct(implementation_type& impl,
- implementation_type& other_impl)
- {
- scheduler_.move_timer(timer_queue_, impl.timer_data, other_impl.timer_data);
-
- impl.expiry = other_impl.expiry;
- other_impl.expiry = time_type();
-
- impl.might_have_pending_waits = other_impl.might_have_pending_waits;
- other_impl.might_have_pending_waits = false;
- }
-
- // Move-assign from another serial port implementation.
- void move_assign(implementation_type& impl,
- deadline_timer_service& other_service,
- implementation_type& other_impl)
- {
- if (this != &other_service)
- if (impl.might_have_pending_waits)
- scheduler_.cancel_timer(timer_queue_, impl.timer_data);
-
- other_service.scheduler_.move_timer(other_service.timer_queue_,
- impl.timer_data, other_impl.timer_data);
-
- impl.expiry = other_impl.expiry;
- other_impl.expiry = time_type();
-
- impl.might_have_pending_waits = other_impl.might_have_pending_waits;
- other_impl.might_have_pending_waits = false;
- }
-
- // Cancel any asynchronous wait operations associated with the timer.
- std::size_t cancel(implementation_type& impl, asio::error_code& ec)
- {
- if (!impl.might_have_pending_waits)
- {
- ec = asio::error_code();
- return 0;
- }
-
- ASIO_HANDLER_OPERATION((scheduler_.context(),
- "deadline_timer", &impl, 0, "cancel"));
-
- std::size_t count = scheduler_.cancel_timer(timer_queue_, impl.timer_data);
- impl.might_have_pending_waits = false;
- ec = asio::error_code();
- return count;
- }
-
- // Cancels one asynchronous wait operation associated with the timer.
- std::size_t cancel_one(implementation_type& impl,
- asio::error_code& ec)
- {
- if (!impl.might_have_pending_waits)
- {
- ec = asio::error_code();
- return 0;
- }
-
- ASIO_HANDLER_OPERATION((scheduler_.context(),
- "deadline_timer", &impl, 0, "cancel_one"));
-
- std::size_t count = scheduler_.cancel_timer(
- timer_queue_, impl.timer_data, 1);
- if (count == 0)
- impl.might_have_pending_waits = false;
- ec = asio::error_code();
- return count;
- }
-
- // Get the expiry time for the timer as an absolute time.
- time_type expiry(const implementation_type& impl) const
- {
- return impl.expiry;
- }
-
- // Get the expiry time for the timer as an absolute time.
- time_type expires_at(const implementation_type& impl) const
- {
- return impl.expiry;
- }
-
- // Get the expiry time for the timer relative to now.
- duration_type expires_from_now(const implementation_type& impl) const
- {
- return Time_Traits::subtract(this->expiry(impl), Time_Traits::now());
- }
-
- // Set the expiry time for the timer as an absolute time.
- std::size_t expires_at(implementation_type& impl,
- const time_type& expiry_time, asio::error_code& ec)
- {
- std::size_t count = cancel(impl, ec);
- impl.expiry = expiry_time;
- ec = asio::error_code();
- return count;
- }
-
- // Set the expiry time for the timer relative to now.
- std::size_t expires_after(implementation_type& impl,
- const duration_type& expiry_time, asio::error_code& ec)
- {
- return expires_at(impl,
- Time_Traits::add(Time_Traits::now(), expiry_time), ec);
- }
-
- // Set the expiry time for the timer relative to now.
- std::size_t expires_from_now(implementation_type& impl,
- const duration_type& expiry_time, asio::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, asio::error_code& ec)
- {
- time_type now = Time_Traits::now();
- ec = asio::error_code();
- while (Time_Traits::less_than(now, impl.expiry) && !ec)
- {
- this->do_wait(Time_Traits::to_posix_duration(
- Time_Traits::subtract(impl.expiry, now)), ec);
- now = Time_Traits::now();
- }
- }
-
- // Start an asynchronous wait on the timer.
- template <typename Handler>
- void async_wait(implementation_type& impl, Handler& handler)
- {
- // Allocate and construct an operation to wrap the handler.
- typedef wait_handler<Handler> op;
- typename op::ptr p = { asio::detail::addressof(handler),
- op::ptr::allocate(handler), 0 };
- p.p = new (p.v) op(handler);
-
- impl.might_have_pending_waits = true;
-
- ASIO_HANDLER_CREATION((scheduler_.context(),
- *p.p, "deadline_timer", &impl, 0, "async_wait"));
-
- scheduler_.schedule_timer(timer_queue_, impl.expiry, impl.timer_data, p.p);
- p.v = p.p = 0;
- }
-
-private:
- // Helper function to wait given a duration type. The duration type should
- // either be of type boost::posix_time::time_duration, or implement the
- // required subset of its interface.
- template <typename Duration>
- void do_wait(const Duration& timeout, asio::error_code& ec)
- {
-#if defined(ASIO_WINDOWS_RUNTIME)
- std::this_thread::sleep_for(
- std::chrono::seconds(timeout.total_seconds())
- + std::chrono::microseconds(timeout.total_microseconds()));
- ec = asio::error_code();
-#else // defined(ASIO_WINDOWS_RUNTIME)
- ::timeval tv;
- tv.tv_sec = timeout.total_seconds();
- tv.tv_usec = timeout.total_microseconds() % 1000000;
- socket_ops::select(0, 0, 0, 0, &tv, ec);
-#endif // defined(ASIO_WINDOWS_RUNTIME)
- }
-
- // 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
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_DETAIL_DEADLINE_TIMER_SERVICE_HPP