mirror of
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316 lines
9.5 KiB
C++
316 lines
9.5 KiB
C++
//
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// strand.hpp
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// ~~~~~~~~~~
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//
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// Copyright (c) 2003-2019 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 BOOST_ASIO_STRAND_HPP
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#define BOOST_ASIO_STRAND_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 <boost/asio/detail/config.hpp>
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#include <boost/asio/detail/strand_executor_service.hpp>
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#include <boost/asio/detail/type_traits.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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/// Provides serialised function invocation for any executor type.
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template <typename Executor>
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class strand
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{
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public:
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/// The type of the underlying executor.
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typedef Executor inner_executor_type;
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/// Default constructor.
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/**
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* This constructor is only valid if the underlying executor type is default
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* constructible.
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*/
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strand()
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: executor_(),
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impl_(use_service<detail::strand_executor_service>(
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executor_.context()).create_implementation())
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{
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}
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/// Construct a strand for the specified executor.
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explicit strand(const Executor& e)
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: executor_(e),
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impl_(use_service<detail::strand_executor_service>(
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executor_.context()).create_implementation())
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{
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}
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/// Copy constructor.
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strand(const strand& other) BOOST_ASIO_NOEXCEPT
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: executor_(other.executor_),
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impl_(other.impl_)
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{
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}
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/// Converting constructor.
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/**
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* This constructor is only valid if the @c OtherExecutor type is convertible
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* to @c Executor.
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*/
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template <class OtherExecutor>
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strand(
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const strand<OtherExecutor>& other) BOOST_ASIO_NOEXCEPT
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: executor_(other.executor_),
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impl_(other.impl_)
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{
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}
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/// Assignment operator.
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strand& operator=(const strand& other) BOOST_ASIO_NOEXCEPT
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{
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executor_ = other.executor_;
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impl_ = other.impl_;
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return *this;
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}
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/// Converting assignment operator.
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/**
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* This assignment operator is only valid if the @c OtherExecutor type is
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* convertible to @c Executor.
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*/
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template <class OtherExecutor>
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strand& operator=(
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const strand<OtherExecutor>& other) BOOST_ASIO_NOEXCEPT
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{
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executor_ = other.executor_;
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impl_ = other.impl_;
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return *this;
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}
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#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
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/// Move constructor.
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strand(strand&& other) BOOST_ASIO_NOEXCEPT
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: executor_(BOOST_ASIO_MOVE_CAST(Executor)(other.executor_)),
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impl_(BOOST_ASIO_MOVE_CAST(implementation_type)(other.impl_))
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{
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}
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/// Converting move constructor.
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/**
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* This constructor is only valid if the @c OtherExecutor type is convertible
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* to @c Executor.
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*/
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template <class OtherExecutor>
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strand(strand<OtherExecutor>&& other) BOOST_ASIO_NOEXCEPT
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: executor_(BOOST_ASIO_MOVE_CAST(OtherExecutor)(other)),
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impl_(BOOST_ASIO_MOVE_CAST(implementation_type)(other.impl_))
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{
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}
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/// Move assignment operator.
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strand& operator=(strand&& other) BOOST_ASIO_NOEXCEPT
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{
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executor_ = BOOST_ASIO_MOVE_CAST(Executor)(other);
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impl_ = BOOST_ASIO_MOVE_CAST(implementation_type)(other.impl_);
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return *this;
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}
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/// Converting move assignment operator.
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/**
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* This assignment operator is only valid if the @c OtherExecutor type is
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* convertible to @c Executor.
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*/
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template <class OtherExecutor>
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strand& operator=(
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const strand<OtherExecutor>&& other) BOOST_ASIO_NOEXCEPT
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{
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executor_ = BOOST_ASIO_MOVE_CAST(OtherExecutor)(other);
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impl_ = BOOST_ASIO_MOVE_CAST(implementation_type)(other.impl_);
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return *this;
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}
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#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
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/// Destructor.
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~strand()
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{
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}
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/// Obtain the underlying executor.
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inner_executor_type get_inner_executor() const BOOST_ASIO_NOEXCEPT
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{
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return executor_;
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}
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/// Obtain the underlying execution context.
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execution_context& context() const BOOST_ASIO_NOEXCEPT
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{
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return executor_.context();
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}
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/// Inform the strand that it has some outstanding work to do.
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/**
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* The strand delegates this call to its underlying executor.
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*/
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void on_work_started() const BOOST_ASIO_NOEXCEPT
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{
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executor_.on_work_started();
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}
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/// Inform the strand that some work is no longer outstanding.
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/**
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* The strand delegates this call to its underlying executor.
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*/
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void on_work_finished() const BOOST_ASIO_NOEXCEPT
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{
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executor_.on_work_finished();
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}
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/// Request the strand to invoke the given function object.
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/**
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* This function is used to ask the strand to execute the given function
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* object on its underlying executor. The function object will be executed
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* inside this function if the strand is not otherwise busy and if the
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* underlying executor's @c dispatch() function is also able to execute the
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* function before returning.
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*
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* @param f The function object to be called. The executor will make
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* a copy of the handler object as required. The function signature of the
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* function object must be: @code void function(); @endcode
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*
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* @param a An allocator that may be used by the executor to allocate the
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* internal storage needed for function invocation.
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*/
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template <typename Function, typename Allocator>
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void dispatch(BOOST_ASIO_MOVE_ARG(Function) f, const Allocator& a) const
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{
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detail::strand_executor_service::dispatch(impl_,
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executor_, BOOST_ASIO_MOVE_CAST(Function)(f), a);
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}
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/// Request the strand to invoke the given function object.
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/**
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* This function is used to ask the executor to execute the given function
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* object. The function object will never be executed inside this function.
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* Instead, it will be scheduled by the underlying executor's defer function.
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*
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* @param f The function object to be called. The executor will make
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* a copy of the handler object as required. The function signature of the
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* function object must be: @code void function(); @endcode
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*
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* @param a An allocator that may be used by the executor to allocate the
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* internal storage needed for function invocation.
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*/
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template <typename Function, typename Allocator>
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void post(BOOST_ASIO_MOVE_ARG(Function) f, const Allocator& a) const
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{
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detail::strand_executor_service::post(impl_,
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executor_, BOOST_ASIO_MOVE_CAST(Function)(f), a);
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}
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/// Request the strand to invoke the given function object.
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/**
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* This function is used to ask the executor to execute the given function
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* object. The function object will never be executed inside this function.
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* Instead, it will be scheduled by the underlying executor's defer function.
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*
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* @param f The function object to be called. The executor will make
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* a copy of the handler object as required. The function signature of the
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* function object must be: @code void function(); @endcode
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*
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* @param a An allocator that may be used by the executor to allocate the
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* internal storage needed for function invocation.
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*/
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template <typename Function, typename Allocator>
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void defer(BOOST_ASIO_MOVE_ARG(Function) f, const Allocator& a) const
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{
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detail::strand_executor_service::defer(impl_,
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executor_, BOOST_ASIO_MOVE_CAST(Function)(f), a);
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}
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/// Determine whether the strand is running in the current thread.
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/**
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* @return @c true if the current thread is executing a function that was
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* submitted to the strand using post(), dispatch() or defer(). Otherwise
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* returns @c false.
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*/
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bool running_in_this_thread() const BOOST_ASIO_NOEXCEPT
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{
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return detail::strand_executor_service::running_in_this_thread(impl_);
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}
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/// Compare two strands for equality.
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/**
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* Two strands are equal if they refer to the same ordered, non-concurrent
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* state.
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*/
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friend bool operator==(const strand& a, const strand& b) BOOST_ASIO_NOEXCEPT
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{
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return a.impl_ == b.impl_;
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}
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/// Compare two strands for inequality.
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/**
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* Two strands are equal if they refer to the same ordered, non-concurrent
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* state.
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*/
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friend bool operator!=(const strand& a, const strand& b) BOOST_ASIO_NOEXCEPT
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{
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return a.impl_ != b.impl_;
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}
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private:
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Executor executor_;
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typedef detail::strand_executor_service::implementation_type
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implementation_type;
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implementation_type impl_;
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};
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/** @defgroup make_strand boost::asio::make_strand
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*
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* @brief The boost::asio::make_strand function creates a @ref strand object for
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* an executor or execution context.
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*/
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/*@{*/
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/// Create a @ref strand object for an executor.
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template <typename Executor>
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inline strand<Executor> make_strand(const Executor& ex,
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typename enable_if<is_executor<Executor>::value>::type* = 0)
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{
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return strand<Executor>(ex);
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}
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/// Create a @ref strand object for an execution context.
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template <typename ExecutionContext>
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inline strand<typename ExecutionContext::executor_type>
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make_strand(ExecutionContext& ctx,
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typename enable_if<
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is_convertible<ExecutionContext&, execution_context&>::value>::type* = 0)
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{
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return strand<typename ExecutionContext::executor_type>(ctx.get_executor());
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}
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/*@}*/
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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// If both io_context.hpp and strand.hpp have been included, automatically
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// include the header file needed for the io_context::strand class.
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#if !defined(BOOST_ASIO_NO_EXTENSIONS)
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# if defined(BOOST_ASIO_IO_CONTEXT_HPP)
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# include <boost/asio/io_context_strand.hpp>
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# endif // defined(BOOST_ASIO_IO_CONTEXT_HPP)
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#endif // !defined(BOOST_ASIO_NO_EXTENSIONS)
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#endif // BOOST_ASIO_STRAND_HPP
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