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+//
+// basic_deadline_timer.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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_BASIC_DEADLINE_TIMER_HPP
+#define ASIO_BASIC_DEADLINE_TIMER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_HAS_BOOST_DATE_TIME) \
+ || defined(GENERATING_DOCUMENTATION)
+
+#include <cstddef>
+#include "asio/any_io_executor.hpp"
+#include "asio/detail/deadline_timer_service.hpp"
+#include "asio/detail/handler_type_requirements.hpp"
+#include "asio/detail/io_object_impl.hpp"
+#include "asio/detail/non_const_lvalue.hpp"
+#include "asio/detail/throw_error.hpp"
+#include "asio/error.hpp"
+#include "asio/execution_context.hpp"
+#include "asio/time_traits.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+/// Provides waitable timer functionality.
+/**
+ * The basic_deadline_timer class template provides the ability to perform a
+ * blocking or asynchronous wait for a timer to expire.
+ *
+ * A deadline timer is always in one of two states: "expired" or "not expired".
+ * If the wait() or async_wait() function is called on an expired timer, the
+ * wait operation will complete immediately.
+ *
+ * Most applications will use the asio::deadline_timer typedef.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Examples
+ * Performing a blocking wait:
+ * @code
+ * // Construct a timer without setting an expiry time.
+ * asio::deadline_timer timer(my_context);
+ *
+ * // Set an expiry time relative to now.
+ * timer.expires_from_now(boost::posix_time::seconds(5));
+ *
+ * // Wait for the timer to expire.
+ * timer.wait();
+ * @endcode
+ *
+ * @par
+ * Performing an asynchronous wait:
+ * @code
+ * void handler(const asio::error_code& error)
+ * {
+ * if (!error)
+ * {
+ * // Timer expired.
+ * }
+ * }
+ *
+ * ...
+ *
+ * // Construct a timer with an absolute expiry time.
+ * asio::deadline_timer timer(my_context,
+ * boost::posix_time::time_from_string("2005-12-07 23:59:59.000"));
+ *
+ * // Start an asynchronous wait.
+ * timer.async_wait(handler);
+ * @endcode
+ *
+ * @par Changing an active deadline_timer's expiry time
+ *
+ * Changing the expiry time of a timer while there are pending asynchronous
+ * waits causes those wait operations to be cancelled. To ensure that the action
+ * associated with the timer is performed only once, use something like this:
+ * used:
+ *
+ * @code
+ * void on_some_event()
+ * {
+ * if (my_timer.expires_from_now(seconds(5)) > 0)
+ * {
+ * // We managed to cancel the timer. Start new asynchronous wait.
+ * my_timer.async_wait(on_timeout);
+ * }
+ * else
+ * {
+ * // Too late, timer has already expired!
+ * }
+ * }
+ *
+ * void on_timeout(const asio::error_code& e)
+ * {
+ * if (e != asio::error::operation_aborted)
+ * {
+ * // Timer was not cancelled, take necessary action.
+ * }
+ * }
+ * @endcode
+ *
+ * @li The asio::basic_deadline_timer::expires_from_now() function
+ * cancels any pending asynchronous waits, and returns the number of
+ * asynchronous waits that were cancelled. If it returns 0 then you were too
+ * late and the wait handler has already been executed, or will soon be
+ * executed. If it returns 1 then the wait handler was successfully cancelled.
+ *
+ * @li If a wait handler is cancelled, the asio::error_code passed to
+ * it contains the value asio::error::operation_aborted.
+ */
+template <typename Time,
+ typename TimeTraits = asio::time_traits<Time>,
+ typename Executor = any_io_executor>
+class basic_deadline_timer
+{
+public:
+ /// The type of the executor associated with the object.
+ typedef Executor executor_type;
+
+ /// Rebinds the timer type to another executor.
+ template <typename Executor1>
+ struct rebind_executor
+ {
+ /// The timer type when rebound to the specified executor.
+ typedef basic_deadline_timer<Time, TimeTraits, Executor1> other;
+ };
+
+ /// The time traits type.
+ typedef TimeTraits traits_type;
+
+ /// The time type.
+ typedef typename traits_type::time_type time_type;
+
+ /// The duration type.
+ typedef typename traits_type::duration_type duration_type;
+
+ /// Constructor.
+ /**
+ * This constructor creates a timer without setting an expiry time. The
+ * expires_at() or expires_from_now() functions must be called to set an
+ * expiry time before the timer can be waited on.
+ *
+ * @param ex The I/O executor that the timer will use, by default, to
+ * dispatch handlers for any asynchronous operations performed on the timer.
+ */
+ explicit basic_deadline_timer(const executor_type& ex)
+ : impl_(0, ex)
+ {
+ }
+
+ /// Constructor.
+ /**
+ * This constructor creates a timer without setting an expiry time. The
+ * expires_at() or expires_from_now() functions must be called to set an
+ * expiry time before the timer can be waited on.
+ *
+ * @param context An execution context which provides the I/O executor that
+ * the timer will use, by default, to dispatch handlers for any asynchronous
+ * operations performed on the timer.
+ */
+ template <typename ExecutionContext>
+ explicit basic_deadline_timer(ExecutionContext& context,
+ typename constraint<
+ is_convertible<ExecutionContext&, execution_context&>::value
+ >::type = 0)
+ : impl_(0, 0, context)
+ {
+ }
+
+ /// Constructor to set a particular expiry time as an absolute time.
+ /**
+ * This constructor creates a timer and sets the expiry time.
+ *
+ * @param ex The I/O executor that the timer will use, by default, to
+ * dispatch handlers for any asynchronous operations performed on the timer.
+ *
+ * @param expiry_time The expiry time to be used for the timer, expressed
+ * as an absolute time.
+ */
+ basic_deadline_timer(const executor_type& ex, const time_type& expiry_time)
+ : impl_(0, ex)
+ {
+ asio::error_code ec;
+ impl_.get_service().expires_at(impl_.get_implementation(), expiry_time, ec);
+ asio::detail::throw_error(ec, "expires_at");
+ }
+
+ /// Constructor to set a particular expiry time as an absolute time.
+ /**
+ * This constructor creates a timer and sets the expiry time.
+ *
+ * @param context An execution context which provides the I/O executor that
+ * the timer will use, by default, to dispatch handlers for any asynchronous
+ * operations performed on the timer.
+ *
+ * @param expiry_time The expiry time to be used for the timer, expressed
+ * as an absolute time.
+ */
+ template <typename ExecutionContext>
+ basic_deadline_timer(ExecutionContext& context, const time_type& expiry_time,
+ typename constraint<
+ is_convertible<ExecutionContext&, execution_context&>::value
+ >::type = 0)
+ : impl_(0, 0, context)
+ {
+ asio::error_code ec;
+ impl_.get_service().expires_at(impl_.get_implementation(), expiry_time, ec);
+ asio::detail::throw_error(ec, "expires_at");
+ }
+
+ /// Constructor to set a particular expiry time relative to now.
+ /**
+ * This constructor creates a timer and sets the expiry time.
+ *
+ * @param ex The I/O executor that the timer will use, by default, to
+ * dispatch handlers for any asynchronous operations performed on the timer.
+ *
+ * @param expiry_time The expiry time to be used for the timer, relative to
+ * now.
+ */
+ basic_deadline_timer(const executor_type& ex,
+ const duration_type& expiry_time)
+ : impl_(0, ex)
+ {
+ asio::error_code ec;
+ impl_.get_service().expires_from_now(
+ impl_.get_implementation(), expiry_time, ec);
+ asio::detail::throw_error(ec, "expires_from_now");
+ }
+
+ /// Constructor to set a particular expiry time relative to now.
+ /**
+ * This constructor creates a timer and sets the expiry time.
+ *
+ * @param context An execution context which provides the I/O executor that
+ * the timer will use, by default, to dispatch handlers for any asynchronous
+ * operations performed on the timer.
+ *
+ * @param expiry_time The expiry time to be used for the timer, relative to
+ * now.
+ */
+ template <typename ExecutionContext>
+ basic_deadline_timer(ExecutionContext& context,
+ const duration_type& expiry_time,
+ typename constraint<
+ is_convertible<ExecutionContext&, execution_context&>::value
+ >::type = 0)
+ : impl_(0, 0, context)
+ {
+ asio::error_code ec;
+ impl_.get_service().expires_from_now(
+ impl_.get_implementation(), expiry_time, ec);
+ asio::detail::throw_error(ec, "expires_from_now");
+ }
+
+#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+ /// Move-construct a basic_deadline_timer from another.
+ /**
+ * This constructor moves a timer from one object to another.
+ *
+ * @param other The other basic_deadline_timer object from which the move will
+ * occur.
+ *
+ * @note Following the move, the moved-from object is in the same state as if
+ * constructed using the @c basic_deadline_timer(const executor_type&)
+ * constructor.
+ */
+ basic_deadline_timer(basic_deadline_timer&& other)
+ : impl_(std::move(other.impl_))
+ {
+ }
+
+ /// Move-assign a basic_deadline_timer from another.
+ /**
+ * This assignment operator moves a timer from one object to another. Cancels
+ * any outstanding asynchronous operations associated with the target object.
+ *
+ * @param other The other basic_deadline_timer object from which the move will
+ * occur.
+ *
+ * @note Following the move, the moved-from object is in the same state as if
+ * constructed using the @c basic_deadline_timer(const executor_type&)
+ * constructor.
+ */
+ basic_deadline_timer& operator=(basic_deadline_timer&& other)
+ {
+ impl_ = std::move(other.impl_);
+ return *this;
+ }
+#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+ /// Destroys the timer.
+ /**
+ * This function destroys the timer, cancelling any outstanding asynchronous
+ * wait operations associated with the timer as if by calling @c cancel.
+ */
+ ~basic_deadline_timer()
+ {
+ }
+
+ /// Get the executor associated with the object.
+ executor_type get_executor() ASIO_NOEXCEPT
+ {
+ return impl_.get_executor();
+ }
+
+ /// Cancel any asynchronous operations that are waiting on the timer.
+ /**
+ * This function forces the completion of any pending asynchronous wait
+ * operations against the timer. The handler for each cancelled operation will
+ * be invoked with the asio::error::operation_aborted error code.
+ *
+ * Cancelling the timer does not change the expiry time.
+ *
+ * @return The number of asynchronous operations that were cancelled.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @note If the timer has already expired when cancel() 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 cancel()
+ {
+ asio::error_code ec;
+ std::size_t s = impl_.get_service().cancel(impl_.get_implementation(), ec);
+ asio::detail::throw_error(ec, "cancel");
+ return s;
+ }
+
+ /// Cancel any asynchronous operations that are waiting on the timer.
+ /**
+ * This function forces the completion of any pending asynchronous wait
+ * operations against the timer. The handler for each cancelled operation will
+ * be invoked with the asio::error::operation_aborted error code.
+ *
+ * Cancelling the timer does not change the expiry time.
+ *
+ * @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 cancel() 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 cancel(asio::error_code& ec)
+ {
+ return impl_.get_service().cancel(impl_.get_implementation(), ec);
+ }
+
+ /// Cancels one asynchronous operation that is waiting on the timer.
+ /**
+ * This function forces the completion of one pending asynchronous wait
+ * operation against the timer. Handlers are cancelled in FIFO order. The
+ * handler for the cancelled operation will be invoked with the
+ * asio::error::operation_aborted error code.
+ *
+ * Cancelling the timer does not change the expiry time.
+ *
+ * @return The number of asynchronous operations that were cancelled. That is,
+ * either 0 or 1.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @note If the timer has already expired when cancel_one() 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 cancel_one()
+ {
+ asio::error_code ec;
+ std::size_t s = impl_.get_service().cancel_one(
+ impl_.get_implementation(), ec);
+ asio::detail::throw_error(ec, "cancel_one");
+ return s;
+ }
+
+ /// Cancels one asynchronous operation that is waiting on the timer.
+ /**
+ * This function forces the completion of one pending asynchronous wait
+ * operation against the timer. Handlers are cancelled in FIFO order. The
+ * handler for the cancelled operation will be invoked with the
+ * asio::error::operation_aborted error code.
+ *
+ * Cancelling the timer does not change the expiry time.
+ *
+ * @param ec Set to indicate what error occurred, if any.
+ *
+ * @return The number of asynchronous operations that were cancelled. That is,
+ * either 0 or 1.
+ *
+ * @note If the timer has already expired when cancel_one() 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 cancel_one(asio::error_code& ec)
+ {
+ return impl_.get_service().cancel_one(impl_.get_implementation(), ec);
+ }
+
+ /// Get the timer's expiry time as an absolute time.
+ /**
+ * This function may be used to obtain the timer's current expiry time.
+ * Whether the timer has expired or not does not affect this value.
+ */
+ time_type expires_at() const
+ {
+ return impl_.get_service().expires_at(impl_.get_implementation());
+ }
+
+ /// Set the timer's expiry time as an absolute time.
+ /**
+ * 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.
+ *
+ * @return The number of asynchronous operations that were cancelled.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @note If the timer has already expired when expires_at() 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_at(const time_type& expiry_time)
+ {
+ asio::error_code ec;
+ std::size_t s = impl_.get_service().expires_at(
+ impl_.get_implementation(), expiry_time, ec);
+ asio::detail::throw_error(ec, "expires_at");
+ return s;
+ }
+
+ /// Set the timer's expiry time as an absolute time.
+ /**
+ * 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_at() 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_at(const time_type& expiry_time,
+ asio::error_code& ec)
+ {
+ return impl_.get_service().expires_at(
+ impl_.get_implementation(), expiry_time, ec);
+ }
+
+ /// Get the timer's expiry time relative to now.
+ /**
+ * This function may be used to obtain the timer's current expiry time.
+ * Whether the timer has expired or not does not affect this value.
+ */
+ duration_type expires_from_now() const
+ {
+ return impl_.get_service().expires_from_now(impl_.get_implementation());
+ }
+
+ /// 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.
+ *
+ * @return The number of asynchronous operations that were cancelled.
+ *
+ * @throws asio::system_error Thrown on failure.
+ *
+ * @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;
+ std::size_t s = impl_.get_service().expires_from_now(
+ impl_.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 impl_.get_service().expires_from_now(
+ impl_.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;
+ impl_.get_service().wait(impl_.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)
+ {
+ impl_.get_service().wait(impl_.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. On
+ * immediate completion, invocation of the handler will be performed in a
+ * manner equivalent to using asio::post().
+ *
+ * @par Per-Operation Cancellation
+ * On POSIX or Windows operating systems, this asynchronous operation supports
+ * cancellation for the following asio::cancellation_type values:
+ *
+ * @li @c cancellation_type::terminal
+ *
+ * @li @c cancellation_type::partial
+ *
+ * @li @c cancellation_type::total
+ */
+ template <
+ ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code))
+ WaitHandler ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+ ASIO_INITFN_AUTO_RESULT_TYPE(WaitHandler,
+ void (asio::error_code))
+ async_wait(
+ ASIO_MOVE_ARG(WaitHandler) handler
+ ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+ {
+ return async_initiate<WaitHandler, void (asio::error_code)>(
+ initiate_async_wait(this), handler);
+ }
+
+private:
+ // Disallow copying and assignment.
+ basic_deadline_timer(const basic_deadline_timer&) ASIO_DELETED;
+ basic_deadline_timer& operator=(
+ const basic_deadline_timer&) ASIO_DELETED;
+
+ class initiate_async_wait
+ {
+ public:
+ typedef Executor executor_type;
+
+ explicit initiate_async_wait(basic_deadline_timer* self)
+ : self_(self)
+ {
+ }
+
+ executor_type get_executor() const ASIO_NOEXCEPT
+ {
+ return self_->get_executor();
+ }
+
+ template <typename WaitHandler>
+ void operator()(ASIO_MOVE_ARG(WaitHandler) handler) const
+ {
+ // 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;
+
+ detail::non_const_lvalue<WaitHandler> handler2(handler);
+ self_->impl_.get_service().async_wait(
+ self_->impl_.get_implementation(),
+ handler2.value, self_->impl_.get_executor());
+ }
+
+ private:
+ basic_deadline_timer* self_;
+ };
+
+ detail::io_object_impl<
+ detail::deadline_timer_service<TimeTraits>, Executor> impl_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_HAS_BOOST_DATE_TIME)
+ // || defined(GENERATING_DOCUMENTATION)
+
+#endif // ASIO_BASIC_DEADLINE_TIMER_HPP