629 lines
21 KiB
C++
629 lines
21 KiB
C++
//
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// basic_deadline_timer.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2018 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_BASIC_DEADLINE_TIMER_HPP
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#define ASIO_BASIC_DEADLINE_TIMER_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/config.hpp"
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#if defined(ASIO_HAS_BOOST_DATE_TIME) \
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|| defined(GENERATING_DOCUMENTATION)
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#include <cstddef>
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#include "asio/basic_io_object.hpp"
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#include "asio/detail/handler_type_requirements.hpp"
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#include "asio/detail/throw_error.hpp"
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#include "asio/error.hpp"
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#include "asio/time_traits.hpp"
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#if defined(ASIO_ENABLE_OLD_SERVICES)
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# include "asio/deadline_timer_service.hpp"
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#else // defined(ASIO_ENABLE_OLD_SERVICES)
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# include "asio/detail/deadline_timer_service.hpp"
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# define ASIO_SVC_T detail::deadline_timer_service<TimeTraits>
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#endif // defined(ASIO_ENABLE_OLD_SERVICES)
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#include "asio/detail/push_options.hpp"
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namespace asio {
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/// Provides waitable timer functionality.
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/**
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* The basic_deadline_timer class template provides the ability to perform a
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* blocking or asynchronous wait for a timer to expire.
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*
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* A deadline timer is always in one of two states: "expired" or "not expired".
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* If the wait() or async_wait() function is called on an expired timer, the
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* wait operation will complete immediately.
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*
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* Most applications will use the asio::deadline_timer typedef.
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*
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* @par Thread Safety
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* @e Distinct @e objects: Safe.@n
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* @e Shared @e objects: Unsafe.
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*
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* @par Examples
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* Performing a blocking wait:
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* @code
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* // Construct a timer without setting an expiry time.
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* asio::deadline_timer timer(io_context);
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*
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* // Set an expiry time relative to now.
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* timer.expires_from_now(boost::posix_time::seconds(5));
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*
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* // Wait for the timer to expire.
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* timer.wait();
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* @endcode
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*
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* @par
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* Performing an asynchronous wait:
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* @code
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* void handler(const asio::error_code& error)
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* {
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* if (!error)
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* {
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* // Timer expired.
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* }
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* }
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*
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* ...
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*
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* // Construct a timer with an absolute expiry time.
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* asio::deadline_timer timer(io_context,
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* boost::posix_time::time_from_string("2005-12-07 23:59:59.000"));
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*
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* // Start an asynchronous wait.
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* timer.async_wait(handler);
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* @endcode
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*
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* @par Changing an active deadline_timer's expiry time
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*
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* Changing the expiry time of a timer while there are pending asynchronous
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* waits causes those wait operations to be cancelled. To ensure that the action
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* associated with the timer is performed only once, use something like this:
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* used:
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*
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* @code
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* void on_some_event()
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* {
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* if (my_timer.expires_from_now(seconds(5)) > 0)
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* {
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* // We managed to cancel the timer. Start new asynchronous wait.
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* my_timer.async_wait(on_timeout);
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* }
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* else
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* {
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* // Too late, timer has already expired!
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* }
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* }
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*
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* void on_timeout(const asio::error_code& e)
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* {
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* if (e != asio::error::operation_aborted)
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* {
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* // Timer was not cancelled, take necessary action.
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* }
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* }
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* @endcode
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*
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* @li The asio::basic_deadline_timer::expires_from_now() function
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* cancels any pending asynchronous waits, and returns the number of
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* asynchronous waits that were cancelled. If it returns 0 then you were too
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* late and the wait handler has already been executed, or will soon be
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* executed. If it returns 1 then the wait handler was successfully cancelled.
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*
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* @li If a wait handler is cancelled, the asio::error_code passed to
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* it contains the value asio::error::operation_aborted.
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*/
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template <typename Time,
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typename TimeTraits = asio::time_traits<Time>
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ASIO_SVC_TPARAM_DEF2(= deadline_timer_service<Time, TimeTraits>)>
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class basic_deadline_timer
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: ASIO_SVC_ACCESS basic_io_object<ASIO_SVC_T>
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{
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public:
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/// The type of the executor associated with the object.
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typedef io_context::executor_type executor_type;
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/// The time traits type.
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typedef TimeTraits traits_type;
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/// The time type.
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typedef typename traits_type::time_type time_type;
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/// The duration type.
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typedef typename traits_type::duration_type duration_type;
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/// Constructor.
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/**
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* This constructor creates a timer without setting an expiry time. The
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* expires_at() or expires_from_now() functions must be called to set an
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* expiry time before the timer can be waited on.
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*
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* @param io_context The io_context object that the timer will use to dispatch
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* handlers for any asynchronous operations performed on the timer.
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*/
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explicit basic_deadline_timer(asio::io_context& io_context)
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: basic_io_object<ASIO_SVC_T>(io_context)
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{
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}
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/// Constructor to set a particular expiry time as an absolute time.
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/**
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* This constructor creates a timer and sets the expiry time.
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*
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* @param io_context The io_context object that the timer will use to dispatch
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* handlers for any asynchronous operations performed on the timer.
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*
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* @param expiry_time The expiry time to be used for the timer, expressed
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* as an absolute time.
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*/
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basic_deadline_timer(asio::io_context& io_context,
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const time_type& expiry_time)
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: basic_io_object<ASIO_SVC_T>(io_context)
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{
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asio::error_code ec;
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this->get_service().expires_at(this->get_implementation(), expiry_time, ec);
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asio::detail::throw_error(ec, "expires_at");
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}
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/// Constructor to set a particular expiry time relative to now.
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/**
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* This constructor creates a timer and sets the expiry time.
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*
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* @param io_context The io_context object that the timer will use to dispatch
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* handlers for any asynchronous operations performed on the timer.
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*
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* @param expiry_time The expiry time to be used for the timer, relative to
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* now.
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*/
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basic_deadline_timer(asio::io_context& io_context,
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const duration_type& expiry_time)
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: basic_io_object<ASIO_SVC_T>(io_context)
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{
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asio::error_code ec;
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this->get_service().expires_from_now(
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this->get_implementation(), expiry_time, ec);
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asio::detail::throw_error(ec, "expires_from_now");
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}
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#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
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/// Move-construct a basic_deadline_timer from another.
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/**
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* This constructor moves a timer from one object to another.
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*
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* @param other The other basic_deadline_timer object from which the move will
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* occur.
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*
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* @note Following the move, the moved-from object is in the same state as if
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* constructed using the @c basic_deadline_timer(io_context&) constructor.
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*/
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basic_deadline_timer(basic_deadline_timer&& other)
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: basic_io_object<ASIO_SVC_T>(std::move(other))
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{
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}
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/// Move-assign a basic_deadline_timer from another.
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/**
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* This assignment operator moves a timer from one object to another. Cancels
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* any outstanding asynchronous operations associated with the target object.
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*
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* @param other The other basic_deadline_timer object from which the move will
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* occur.
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*
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* @note Following the move, the moved-from object is in the same state as if
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* constructed using the @c basic_deadline_timer(io_context&) constructor.
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*/
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basic_deadline_timer& operator=(basic_deadline_timer&& other)
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{
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basic_io_object<ASIO_SVC_T>::operator=(std::move(other));
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return *this;
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}
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#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
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/// Destroys the timer.
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/**
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* This function destroys the timer, cancelling any outstanding asynchronous
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* wait operations associated with the timer as if by calling @c cancel.
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*/
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~basic_deadline_timer()
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{
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}
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#if defined(ASIO_ENABLE_OLD_SERVICES)
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// These functions are provided by basic_io_object<>.
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#else // defined(ASIO_ENABLE_OLD_SERVICES)
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#if !defined(ASIO_NO_DEPRECATED)
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/// (Deprecated: Use get_executor().) Get the io_context associated with the
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/// object.
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/**
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* This function may be used to obtain the io_context object that the I/O
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* object uses to dispatch handlers for asynchronous operations.
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*
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* @return A reference to the io_context object that the I/O object will use
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* to dispatch handlers. Ownership is not transferred to the caller.
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*/
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asio::io_context& get_io_context()
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{
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return basic_io_object<ASIO_SVC_T>::get_io_context();
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}
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/// (Deprecated: Use get_executor().) Get the io_context associated with the
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/// object.
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/**
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* This function may be used to obtain the io_context object that the I/O
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* object uses to dispatch handlers for asynchronous operations.
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*
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* @return A reference to the io_context object that the I/O object will use
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* to dispatch handlers. Ownership is not transferred to the caller.
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*/
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asio::io_context& get_io_service()
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{
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return basic_io_object<ASIO_SVC_T>::get_io_service();
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}
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#endif // !defined(ASIO_NO_DEPRECATED)
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/// Get the executor associated with the object.
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executor_type get_executor() ASIO_NOEXCEPT
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{
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return basic_io_object<ASIO_SVC_T>::get_executor();
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}
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#endif // defined(ASIO_ENABLE_OLD_SERVICES)
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/// Cancel any asynchronous operations that are waiting on the timer.
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/**
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* This function forces the completion of any pending asynchronous wait
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* operations against the timer. The handler for each cancelled operation will
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* be invoked with the asio::error::operation_aborted error code.
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*
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* Cancelling the timer does not change the expiry time.
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*
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* @return The number of asynchronous operations that were cancelled.
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*
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* @throws asio::system_error Thrown on failure.
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*
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* @note If the timer has already expired when cancel() is called, then the
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* handlers for asynchronous wait operations will:
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*
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* @li have already been invoked; or
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*
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* @li have been queued for invocation in the near future.
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*
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* These handlers can no longer be cancelled, and therefore are passed an
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* error code that indicates the successful completion of the wait operation.
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*/
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std::size_t cancel()
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{
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asio::error_code ec;
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std::size_t s = this->get_service().cancel(this->get_implementation(), ec);
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asio::detail::throw_error(ec, "cancel");
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return s;
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}
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/// Cancel any asynchronous operations that are waiting on the timer.
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/**
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* This function forces the completion of any pending asynchronous wait
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* operations against the timer. The handler for each cancelled operation will
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* be invoked with the asio::error::operation_aborted error code.
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*
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* Cancelling the timer does not change the expiry time.
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*
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* @param ec Set to indicate what error occurred, if any.
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*
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* @return The number of asynchronous operations that were cancelled.
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*
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* @note If the timer has already expired when cancel() is called, then the
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* handlers for asynchronous wait operations will:
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*
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* @li have already been invoked; or
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*
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* @li have been queued for invocation in the near future.
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*
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* These handlers can no longer be cancelled, and therefore are passed an
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* error code that indicates the successful completion of the wait operation.
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*/
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std::size_t cancel(asio::error_code& ec)
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{
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return this->get_service().cancel(this->get_implementation(), ec);
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}
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/// Cancels one asynchronous operation that is waiting on the timer.
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/**
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* This function forces the completion of one pending asynchronous wait
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* operation against the timer. Handlers are cancelled in FIFO order. The
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* handler for the cancelled operation will be invoked with the
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* asio::error::operation_aborted error code.
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*
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* Cancelling the timer does not change the expiry time.
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*
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* @return The number of asynchronous operations that were cancelled. That is,
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* either 0 or 1.
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*
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* @throws asio::system_error Thrown on failure.
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*
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* @note If the timer has already expired when cancel_one() is called, then
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* the handlers for asynchronous wait operations will:
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*
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* @li have already been invoked; or
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*
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* @li have been queued for invocation in the near future.
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*
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* These handlers can no longer be cancelled, and therefore are passed an
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* error code that indicates the successful completion of the wait operation.
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*/
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std::size_t cancel_one()
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{
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asio::error_code ec;
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std::size_t s = this->get_service().cancel_one(
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this->get_implementation(), ec);
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asio::detail::throw_error(ec, "cancel_one");
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return s;
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}
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/// Cancels one asynchronous operation that is waiting on the timer.
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/**
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* This function forces the completion of one pending asynchronous wait
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* operation against the timer. Handlers are cancelled in FIFO order. The
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* handler for the cancelled operation will be invoked with the
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* asio::error::operation_aborted error code.
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*
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* Cancelling the timer does not change the expiry time.
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*
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* @param ec Set to indicate what error occurred, if any.
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*
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* @return The number of asynchronous operations that were cancelled. That is,
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* either 0 or 1.
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*
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* @note If the timer has already expired when cancel_one() is called, then
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* the handlers for asynchronous wait operations will:
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*
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* @li have already been invoked; or
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*
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* @li have been queued for invocation in the near future.
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*
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* These handlers can no longer be cancelled, and therefore are passed an
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* error code that indicates the successful completion of the wait operation.
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*/
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std::size_t cancel_one(asio::error_code& ec)
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{
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return this->get_service().cancel_one(this->get_implementation(), ec);
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}
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/// Get the timer's expiry time as an absolute time.
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/**
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* This function may be used to obtain the timer's current expiry time.
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* Whether the timer has expired or not does not affect this value.
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*/
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time_type expires_at() const
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{
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return this->get_service().expires_at(this->get_implementation());
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}
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/// Set the timer's expiry time as an absolute time.
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/**
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* This function sets the expiry time. Any pending asynchronous wait
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* operations will be cancelled. The handler for each cancelled operation will
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* be invoked with the asio::error::operation_aborted error code.
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*
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* @param expiry_time The expiry time to be used for the timer.
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*
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* @return The number of asynchronous operations that were cancelled.
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*
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* @throws asio::system_error Thrown on failure.
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*
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* @note If the timer has already expired when expires_at() is called, then
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* the handlers for asynchronous wait operations will:
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*
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* @li have already been invoked; or
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*
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* @li have been queued for invocation in the near future.
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*
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* These handlers can no longer be cancelled, and therefore are passed an
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* error code that indicates the successful completion of the wait operation.
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*/
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std::size_t expires_at(const time_type& expiry_time)
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{
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asio::error_code ec;
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std::size_t s = this->get_service().expires_at(
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this->get_implementation(), expiry_time, ec);
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asio::detail::throw_error(ec, "expires_at");
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return s;
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}
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|
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/// Set the timer's expiry time as an absolute time.
|
|
/**
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* This function sets the expiry time. Any pending asynchronous wait
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* operations will be cancelled. The handler for each cancelled operation will
|
|
* be invoked with the asio::error::operation_aborted error code.
|
|
*
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|
* @param expiry_time The expiry time to be used for the timer.
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*
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* @param ec Set to indicate what error occurred, if any.
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*
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* @return The number of asynchronous operations that were cancelled.
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*
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* @note If the timer has already expired when expires_at() is called, then
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* the handlers for asynchronous wait operations will:
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|
*
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* @li have already been invoked; or
|
|
*
|
|
* @li have been queued for invocation in the near future.
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|
*
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* These handlers can no longer be cancelled, and therefore are passed an
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* error code that indicates the successful completion of the wait operation.
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*/
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std::size_t expires_at(const time_type& expiry_time,
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asio::error_code& ec)
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{
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return this->get_service().expires_at(
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this->get_implementation(), expiry_time, ec);
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}
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|
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/// Get the timer's expiry time relative to now.
|
|
/**
|
|
* This function may be used to obtain the timer's current expiry time.
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* Whether the timer has expired or not does not affect this value.
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*/
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duration_type expires_from_now() const
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{
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return this->get_service().expires_from_now(this->get_implementation());
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}
|
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|
|
/// Set the timer's expiry time relative to now.
|
|
/**
|
|
* This function sets the expiry time. Any pending asynchronous wait
|
|
* operations will be cancelled. The handler for each cancelled operation will
|
|
* be invoked with the asio::error::operation_aborted error code.
|
|
*
|
|
* @param expiry_time The expiry time to be used for the timer.
|
|
*
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* @return The number of asynchronous operations that were cancelled.
|
|
*
|
|
* @throws asio::system_error Thrown on failure.
|
|
*
|
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* @note If the timer has already expired when expires_from_now() is called,
|
|
* then the handlers for asynchronous wait operations will:
|
|
*
|
|
* @li have already been invoked; or
|
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*
|
|
* @li have been queued for invocation in the near future.
|
|
*
|
|
* These handlers can no longer be cancelled, and therefore are passed an
|
|
* error code that indicates the successful completion of the wait operation.
|
|
*/
|
|
std::size_t expires_from_now(const duration_type& expiry_time)
|
|
{
|
|
asio::error_code ec;
|
|
std::size_t s = this->get_service().expires_from_now(
|
|
this->get_implementation(), expiry_time, ec);
|
|
asio::detail::throw_error(ec, "expires_from_now");
|
|
return s;
|
|
}
|
|
|
|
/// Set the timer's expiry time relative to now.
|
|
/**
|
|
* This function sets the expiry time. Any pending asynchronous wait
|
|
* operations will be cancelled. The handler for each cancelled operation will
|
|
* be invoked with the asio::error::operation_aborted error code.
|
|
*
|
|
* @param expiry_time The expiry time to be used for the timer.
|
|
*
|
|
* @param ec Set to indicate what error occurred, if any.
|
|
*
|
|
* @return The number of asynchronous operations that were cancelled.
|
|
*
|
|
* @note If the timer has already expired when expires_from_now() is called,
|
|
* then the handlers for asynchronous wait operations will:
|
|
*
|
|
* @li have already been invoked; or
|
|
*
|
|
* @li have been queued for invocation in the near future.
|
|
*
|
|
* These handlers can no longer be cancelled, and therefore are passed an
|
|
* error code that indicates the successful completion of the wait operation.
|
|
*/
|
|
std::size_t expires_from_now(const duration_type& expiry_time,
|
|
asio::error_code& ec)
|
|
{
|
|
return this->get_service().expires_from_now(
|
|
this->get_implementation(), expiry_time, ec);
|
|
}
|
|
|
|
/// Perform a blocking wait on the timer.
|
|
/**
|
|
* This function is used to wait for the timer to expire. This function
|
|
* blocks and does not return until the timer has expired.
|
|
*
|
|
* @throws asio::system_error Thrown on failure.
|
|
*/
|
|
void wait()
|
|
{
|
|
asio::error_code ec;
|
|
this->get_service().wait(this->get_implementation(), ec);
|
|
asio::detail::throw_error(ec, "wait");
|
|
}
|
|
|
|
/// Perform a blocking wait on the timer.
|
|
/**
|
|
* This function is used to wait for the timer to expire. This function
|
|
* blocks and does not return until the timer has expired.
|
|
*
|
|
* @param ec Set to indicate what error occurred, if any.
|
|
*/
|
|
void wait(asio::error_code& ec)
|
|
{
|
|
this->get_service().wait(this->get_implementation(), ec);
|
|
}
|
|
|
|
/// Start an asynchronous wait on the timer.
|
|
/**
|
|
* This function may be used to initiate an asynchronous wait against the
|
|
* timer. It always returns immediately.
|
|
*
|
|
* For each call to async_wait(), the supplied handler will be called exactly
|
|
* once. The handler will be called when:
|
|
*
|
|
* @li The timer has expired.
|
|
*
|
|
* @li The timer was cancelled, in which case the handler is passed the error
|
|
* code asio::error::operation_aborted.
|
|
*
|
|
* @param handler The handler to be called when the timer expires. Copies
|
|
* will be made of the handler as required. The function signature of the
|
|
* handler must be:
|
|
* @code void handler(
|
|
* const asio::error_code& error // Result of operation.
|
|
* ); @endcode
|
|
* Regardless of whether the asynchronous operation completes immediately or
|
|
* not, the handler will not be invoked from within this function. Invocation
|
|
* of the handler will be performed in a manner equivalent to using
|
|
* asio::io_context::post().
|
|
*/
|
|
template <typename WaitHandler>
|
|
ASIO_INITFN_RESULT_TYPE(WaitHandler,
|
|
void (asio::error_code))
|
|
async_wait(ASIO_MOVE_ARG(WaitHandler) handler)
|
|
{
|
|
// If you get an error on the following line it means that your handler does
|
|
// not meet the documented type requirements for a WaitHandler.
|
|
ASIO_WAIT_HANDLER_CHECK(WaitHandler, handler) type_check;
|
|
|
|
#if defined(ASIO_ENABLE_OLD_SERVICES)
|
|
return this->get_service().async_wait(this->get_implementation(),
|
|
ASIO_MOVE_CAST(WaitHandler)(handler));
|
|
#else // defined(ASIO_ENABLE_OLD_SERVICES)
|
|
async_completion<WaitHandler,
|
|
void (asio::error_code)> init(handler);
|
|
|
|
this->get_service().async_wait(this->get_implementation(),
|
|
init.completion_handler);
|
|
|
|
return init.result.get();
|
|
#endif // defined(ASIO_ENABLE_OLD_SERVICES)
|
|
}
|
|
};
|
|
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#if !defined(ASIO_ENABLE_OLD_SERVICES)
|
|
# undef ASIO_SVC_T
|
|
#endif // !defined(ASIO_ENABLE_OLD_SERVICES)
|
|
|
|
#endif // defined(ASIO_HAS_BOOST_DATE_TIME)
|
|
// || defined(GENERATING_DOCUMENTATION)
|
|
|
|
#endif // ASIO_BASIC_DEADLINE_TIMER_HPP
|