515 lines
13 KiB
C++
515 lines
13 KiB
C++
//
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// detail/handler_work.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 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_DETAIL_HANDLER_WORK_HPP
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#define ASIO_DETAIL_HANDLER_WORK_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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#include "asio/associated_executor.hpp"
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#include "asio/detail/handler_invoke_helpers.hpp"
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#include "asio/detail/type_traits.hpp"
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#include "asio/execution/allocator.hpp"
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#include "asio/execution/blocking.hpp"
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#include "asio/execution/execute.hpp"
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#include "asio/execution/executor.hpp"
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#include "asio/execution/outstanding_work.hpp"
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#include "asio/executor_work_guard.hpp"
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#include "asio/prefer.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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class executor;
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class io_context;
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#if !defined(ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
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class any_io_executor;
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#endif // !defined(ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
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namespace execution {
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#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename...> class any_executor;
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#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename, typename, typename, typename, typename,
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typename, typename, typename, typename> class any_executor;
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#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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} // namespace execution
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namespace detail {
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template <typename Executor, typename CandidateExecutor = void,
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typename IoContext = io_context,
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typename PolymorphicExecutor = executor, typename = void>
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class handler_work_base
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{
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public:
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explicit handler_work_base(int, int, const Executor& ex) ASIO_NOEXCEPT
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: executor_(asio::prefer(ex, execution::outstanding_work.tracked))
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{
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}
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template <typename OtherExecutor>
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handler_work_base(const Executor& ex,
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const OtherExecutor&) ASIO_NOEXCEPT
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: executor_(asio::prefer(ex, execution::outstanding_work.tracked))
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{
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}
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handler_work_base(const handler_work_base& other) ASIO_NOEXCEPT
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: executor_(other.executor_)
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{
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}
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#if defined(ASIO_HAS_MOVE)
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handler_work_base(handler_work_base&& other) ASIO_NOEXCEPT
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: executor_(ASIO_MOVE_CAST(executor_type)(other.executor_))
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{
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}
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#endif // defined(ASIO_HAS_MOVE)
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bool owns_work() const ASIO_NOEXCEPT
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{
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return true;
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}
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template <typename Function, typename Handler>
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void dispatch(Function& function, Handler& handler)
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{
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execution::execute(
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asio::prefer(executor_,
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execution::blocking.possibly,
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execution::allocator((get_associated_allocator)(handler))),
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ASIO_MOVE_CAST(Function)(function));
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}
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private:
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typedef typename decay<
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typename prefer_result<Executor,
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execution::outstanding_work_t::tracked_t
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>::type
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>::type executor_type;
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executor_type executor_;
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};
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template <typename Executor, typename CandidateExecutor,
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typename IoContext, typename PolymorphicExecutor>
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class handler_work_base<Executor, CandidateExecutor,
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IoContext, PolymorphicExecutor,
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typename enable_if<
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!execution::is_executor<Executor>::value
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&& (!is_same<Executor, PolymorphicExecutor>::value
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|| !is_same<CandidateExecutor, void>::value)
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>::type>
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{
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public:
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explicit handler_work_base(int, int, const Executor& ex) ASIO_NOEXCEPT
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: executor_(ex),
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owns_work_(true)
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{
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executor_.on_work_started();
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}
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handler_work_base(const Executor& ex,
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const Executor& candidate) ASIO_NOEXCEPT
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: executor_(ex),
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owns_work_(ex != candidate)
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{
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if (owns_work_)
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executor_.on_work_started();
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}
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template <typename OtherExecutor>
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handler_work_base(const Executor& ex,
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const OtherExecutor&) ASIO_NOEXCEPT
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: executor_(ex),
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owns_work_(true)
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{
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executor_.on_work_started();
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}
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handler_work_base(const handler_work_base& other) ASIO_NOEXCEPT
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: executor_(other.executor_),
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owns_work_(other.owns_work_)
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{
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if (owns_work_)
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executor_.on_work_started();
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}
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#if defined(ASIO_HAS_MOVE)
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handler_work_base(handler_work_base&& other) ASIO_NOEXCEPT
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: executor_(ASIO_MOVE_CAST(Executor)(other.executor_)),
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owns_work_(other.owns_work_)
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{
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other.owns_work_ = false;
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}
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#endif // defined(ASIO_HAS_MOVE)
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~handler_work_base()
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{
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if (owns_work_)
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executor_.on_work_finished();
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}
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bool owns_work() const ASIO_NOEXCEPT
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{
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return owns_work_;
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}
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template <typename Function, typename Handler>
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void dispatch(Function& function, Handler& handler)
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{
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executor_.dispatch(ASIO_MOVE_CAST(Function)(function),
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asio::get_associated_allocator(handler));
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}
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private:
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Executor executor_;
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bool owns_work_;
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};
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template <typename Executor, typename IoContext, typename PolymorphicExecutor>
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class handler_work_base<Executor, void, IoContext, PolymorphicExecutor,
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typename enable_if<
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is_same<
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Executor,
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typename IoContext::executor_type
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>::value
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>::type>
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{
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public:
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explicit handler_work_base(int, int, const Executor&)
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{
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}
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bool owns_work() const ASIO_NOEXCEPT
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{
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return false;
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}
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template <typename Function, typename Handler>
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void dispatch(Function& function, Handler& handler)
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{
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// When using a native implementation, I/O completion handlers are
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// already dispatched according to the execution context's executor's
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// rules. We can call the function directly.
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asio_handler_invoke_helpers::invoke(function, handler);
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}
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};
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template <typename Executor, typename IoContext>
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class handler_work_base<Executor, void, IoContext, Executor>
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{
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public:
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explicit handler_work_base(int, int, const Executor& ex) ASIO_NOEXCEPT
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#if !defined(ASIO_NO_TYPEID)
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: executor_(
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ex.target_type() == typeid(typename IoContext::executor_type)
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? Executor() : ex)
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#else // !defined(ASIO_NO_TYPEID)
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: executor_(ex)
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#endif // !defined(ASIO_NO_TYPEID)
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{
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if (executor_)
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executor_.on_work_started();
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}
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handler_work_base(const Executor& ex,
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const Executor& candidate) ASIO_NOEXCEPT
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: executor_(ex != candidate ? ex : Executor())
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{
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if (executor_)
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executor_.on_work_started();
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}
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template <typename OtherExecutor>
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handler_work_base(const Executor& ex,
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const OtherExecutor&) ASIO_NOEXCEPT
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: executor_(ex)
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{
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executor_.on_work_started();
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}
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handler_work_base(const handler_work_base& other) ASIO_NOEXCEPT
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: executor_(other.executor_)
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{
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if (executor_)
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executor_.on_work_started();
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}
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#if defined(ASIO_HAS_MOVE)
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handler_work_base(handler_work_base&& other) ASIO_NOEXCEPT
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: executor_(ASIO_MOVE_CAST(Executor)(other.executor_))
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{
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}
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#endif // defined(ASIO_HAS_MOVE)
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~handler_work_base()
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{
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if (executor_)
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executor_.on_work_finished();
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}
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bool owns_work() const ASIO_NOEXCEPT
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{
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return !!executor_;
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}
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template <typename Function, typename Handler>
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void dispatch(Function& function, Handler& handler)
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{
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executor_.dispatch(ASIO_MOVE_CAST(Function)(function),
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asio::get_associated_allocator(handler));
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}
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private:
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Executor executor_;
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};
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template <
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#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
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typename... SupportableProperties,
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#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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typename T1, typename T2, typename T3, typename T4, typename T5,
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typename T6, typename T7, typename T8, typename T9,
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#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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typename IoContext, typename PolymorphicExecutor>
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class handler_work_base<
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#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
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execution::any_executor<SupportableProperties...>,
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#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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execution::any_executor<T1, T2, T3, T4, T5, T6, T7, T8, T9>,
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#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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void, IoContext, PolymorphicExecutor>
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{
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public:
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typedef
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#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
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execution::any_executor<SupportableProperties...>
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#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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execution::any_executor<T1, T2, T3, T4, T5, T6, T7, T8, T9>
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#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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executor_type;
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explicit handler_work_base(int, int,
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const executor_type& ex) ASIO_NOEXCEPT
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#if !defined(ASIO_NO_TYPEID)
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: executor_(
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ex.target_type() == typeid(typename IoContext::executor_type)
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? executor_type()
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: asio::prefer(ex, execution::outstanding_work.tracked))
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#else // !defined(ASIO_NO_TYPEID)
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: executor_(asio::prefer(ex, execution::outstanding_work.tracked))
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#endif // !defined(ASIO_NO_TYPEID)
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{
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}
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handler_work_base(const executor_type& ex,
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const executor_type& candidate) ASIO_NOEXCEPT
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: executor_(ex != candidate ? ex : executor_type())
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{
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}
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template <typename OtherExecutor>
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handler_work_base(const executor_type& ex,
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const OtherExecutor&) ASIO_NOEXCEPT
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: executor_(asio::prefer(ex, execution::outstanding_work.tracked))
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{
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}
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handler_work_base(const handler_work_base& other) ASIO_NOEXCEPT
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: executor_(other.executor_)
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{
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}
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#if defined(ASIO_HAS_MOVE)
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handler_work_base(handler_work_base&& other) ASIO_NOEXCEPT
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: executor_(ASIO_MOVE_CAST(executor_type)(other.executor_))
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{
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}
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#endif // defined(ASIO_HAS_MOVE)
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bool owns_work() const ASIO_NOEXCEPT
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{
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return !!executor_;
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}
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template <typename Function, typename Handler>
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void dispatch(Function& function, Handler&)
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{
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execution::execute(
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asio::prefer(executor_, execution::blocking.possibly),
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ASIO_MOVE_CAST(Function)(function));
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}
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private:
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executor_type executor_;
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};
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#if !defined(ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
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template <typename Executor, typename IoContext, typename PolymorphicExecutor>
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class handler_work_base<Executor, void, IoContext, PolymorphicExecutor,
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typename enable_if<
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is_same<
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Executor,
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any_io_executor
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>::value
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>::type>
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{
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public:
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typedef Executor executor_type;
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explicit handler_work_base(int, int,
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const executor_type& ex) ASIO_NOEXCEPT
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#if !defined(ASIO_NO_TYPEID)
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: executor_(
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ex.target_type() == typeid(typename IoContext::executor_type)
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? executor_type()
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: asio::prefer(ex, execution::outstanding_work.tracked))
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#else // !defined(ASIO_NO_TYPEID)
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: executor_(asio::prefer(ex, execution::outstanding_work.tracked))
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#endif // !defined(ASIO_NO_TYPEID)
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{
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}
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handler_work_base(const executor_type& ex,
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const executor_type& candidate) ASIO_NOEXCEPT
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: executor_(ex != candidate ? ex : executor_type())
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{
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}
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template <typename OtherExecutor>
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handler_work_base(const executor_type& ex,
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const OtherExecutor&) ASIO_NOEXCEPT
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: executor_(asio::prefer(ex, execution::outstanding_work.tracked))
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{
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}
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handler_work_base(const handler_work_base& other) ASIO_NOEXCEPT
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: executor_(other.executor_)
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{
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}
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#if defined(ASIO_HAS_MOVE)
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handler_work_base(handler_work_base&& other) ASIO_NOEXCEPT
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: executor_(ASIO_MOVE_CAST(executor_type)(other.executor_))
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{
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}
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#endif // defined(ASIO_HAS_MOVE)
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bool owns_work() const ASIO_NOEXCEPT
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{
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return !!executor_;
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}
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template <typename Function, typename Handler>
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void dispatch(Function& function, Handler&)
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{
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execution::execute(
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asio::prefer(executor_, execution::blocking.possibly),
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ASIO_MOVE_CAST(Function)(function));
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}
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private:
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executor_type executor_;
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};
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#endif // !defined(ASIO_USE_TS_EXECUTOR_AS_DEFAULT)
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template <typename Handler, typename IoExecutor, typename = void>
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class handler_work :
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handler_work_base<IoExecutor>,
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handler_work_base<typename associated_executor<
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Handler, IoExecutor>::type, IoExecutor>
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{
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public:
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typedef handler_work_base<IoExecutor> base1_type;
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typedef handler_work_base<typename associated_executor<
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Handler, IoExecutor>::type, IoExecutor> base2_type;
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handler_work(Handler& handler, const IoExecutor& io_ex) ASIO_NOEXCEPT
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: base1_type(0, 0, io_ex),
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base2_type(asio::get_associated_executor(handler, io_ex), io_ex)
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{
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}
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template <typename Function>
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void complete(Function& function, Handler& handler)
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{
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if (!base1_type::owns_work() && !base2_type::owns_work())
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{
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// When using a native implementation, I/O completion handlers are
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// already dispatched according to the execution context's executor's
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// rules. We can call the function directly.
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asio_handler_invoke_helpers::invoke(function, handler);
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}
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else
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{
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base2_type::dispatch(function, handler);
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}
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}
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};
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template <typename Handler, typename IoExecutor>
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class handler_work<
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Handler, IoExecutor,
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typename enable_if<
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is_same<
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typename associated_executor<Handler,
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IoExecutor>::asio_associated_executor_is_unspecialised,
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void
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>::value
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>::type> : handler_work_base<IoExecutor>
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{
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public:
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typedef handler_work_base<IoExecutor> base1_type;
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handler_work(Handler&, const IoExecutor& io_ex) ASIO_NOEXCEPT
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: base1_type(0, 0, io_ex)
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{
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}
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template <typename Function>
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void complete(Function& function, Handler& handler)
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{
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if (!base1_type::owns_work())
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{
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// When using a native implementation, I/O completion handlers are
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// already dispatched according to the execution context's executor's
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// rules. We can call the function directly.
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asio_handler_invoke_helpers::invoke(function, handler);
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}
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else
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{
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base1_type::dispatch(function, handler);
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}
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}
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_DETAIL_HANDLER_WORK_HPP
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