253 lines
7.4 KiB
C++
253 lines
7.4 KiB
C++
//
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// impl/post.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_IMPL_POST_HPP
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#define ASIO_IMPL_POST_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_allocator.hpp"
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#include "asio/associated_executor.hpp"
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#include "asio/detail/work_dispatcher.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/relationship.hpp"
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#include "asio/prefer.hpp"
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#include "asio/require.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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class initiate_post
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{
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public:
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template <typename CompletionHandler>
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void operator()(ASIO_MOVE_ARG(CompletionHandler) handler,
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typename enable_if<
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execution::is_executor<
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typename associated_executor<
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typename decay<CompletionHandler>::type
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>::type
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>::value
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>::type* = 0) const
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{
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typedef typename decay<CompletionHandler>::type handler_t;
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typename associated_executor<handler_t>::type ex(
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(get_associated_executor)(handler));
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typename associated_allocator<handler_t>::type alloc(
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(get_associated_allocator)(handler));
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execution::execute(
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asio::prefer(
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asio::require(ex, execution::blocking.never),
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execution::relationship.fork,
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execution::allocator(alloc)),
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ASIO_MOVE_CAST(CompletionHandler)(handler));
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}
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template <typename CompletionHandler>
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void operator()(ASIO_MOVE_ARG(CompletionHandler) handler,
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typename enable_if<
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!execution::is_executor<
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typename associated_executor<
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typename decay<CompletionHandler>::type
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>::type
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>::value
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>::type* = 0) const
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{
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typedef typename decay<CompletionHandler>::type handler_t;
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typename associated_executor<handler_t>::type ex(
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(get_associated_executor)(handler));
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typename associated_allocator<handler_t>::type alloc(
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(get_associated_allocator)(handler));
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ex.post(ASIO_MOVE_CAST(CompletionHandler)(handler), alloc);
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}
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};
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template <typename Executor>
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class initiate_post_with_executor
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{
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public:
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typedef Executor executor_type;
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explicit initiate_post_with_executor(const Executor& ex)
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: ex_(ex)
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{
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}
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executor_type get_executor() const ASIO_NOEXCEPT
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{
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return ex_;
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}
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template <typename CompletionHandler>
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void operator()(ASIO_MOVE_ARG(CompletionHandler) handler,
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typename enable_if<
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execution::is_executor<
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typename conditional<true, executor_type, CompletionHandler>::type
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>::value
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>::type* = 0,
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typename enable_if<
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!detail::is_work_dispatcher_required<
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typename decay<CompletionHandler>::type,
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Executor
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>::value
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>::type* = 0) const
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{
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typedef typename decay<CompletionHandler>::type handler_t;
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typename associated_allocator<handler_t>::type alloc(
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(get_associated_allocator)(handler));
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execution::execute(
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asio::prefer(
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asio::require(ex_, execution::blocking.never),
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execution::relationship.fork,
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execution::allocator(alloc)),
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ASIO_MOVE_CAST(CompletionHandler)(handler));
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}
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template <typename CompletionHandler>
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void operator()(ASIO_MOVE_ARG(CompletionHandler) handler,
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typename enable_if<
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execution::is_executor<
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typename conditional<true, executor_type, CompletionHandler>::type
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>::value
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>::type* = 0,
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typename enable_if<
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detail::is_work_dispatcher_required<
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typename decay<CompletionHandler>::type,
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Executor
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>::value
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>::type* = 0) const
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{
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typedef typename decay<CompletionHandler>::type handler_t;
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typedef typename associated_executor<
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handler_t, Executor>::type handler_ex_t;
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handler_ex_t handler_ex((get_associated_executor)(handler, ex_));
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typename associated_allocator<handler_t>::type alloc(
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(get_associated_allocator)(handler));
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execution::execute(
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asio::prefer(
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asio::require(ex_, execution::blocking.never),
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execution::relationship.fork,
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execution::allocator(alloc)),
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detail::work_dispatcher<handler_t, handler_ex_t>(
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ASIO_MOVE_CAST(CompletionHandler)(handler), handler_ex));
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}
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template <typename CompletionHandler>
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void operator()(ASIO_MOVE_ARG(CompletionHandler) handler,
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typename enable_if<
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!execution::is_executor<
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typename conditional<true, executor_type, CompletionHandler>::type
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>::value
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>::type* = 0,
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typename enable_if<
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!detail::is_work_dispatcher_required<
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typename decay<CompletionHandler>::type,
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Executor
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>::value
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>::type* = 0) const
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{
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typedef typename decay<CompletionHandler>::type handler_t;
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typename associated_allocator<handler_t>::type alloc(
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(get_associated_allocator)(handler));
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ex_.post(ASIO_MOVE_CAST(CompletionHandler)(handler), alloc);
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}
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template <typename CompletionHandler>
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void operator()(ASIO_MOVE_ARG(CompletionHandler) handler,
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typename enable_if<
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!execution::is_executor<
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typename conditional<true, executor_type, CompletionHandler>::type
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>::value
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>::type* = 0,
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typename enable_if<
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detail::is_work_dispatcher_required<
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typename decay<CompletionHandler>::type,
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Executor
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>::value
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>::type* = 0) const
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{
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typedef typename decay<CompletionHandler>::type handler_t;
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typedef typename associated_executor<
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handler_t, Executor>::type handler_ex_t;
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handler_ex_t handler_ex((get_associated_executor)(handler, ex_));
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typename associated_allocator<handler_t>::type alloc(
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(get_associated_allocator)(handler));
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ex_.post(detail::work_dispatcher<handler_t, handler_ex_t>(
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ASIO_MOVE_CAST(CompletionHandler)(handler),
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handler_ex), alloc);
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}
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private:
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Executor ex_;
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};
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} // namespace detail
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template <ASIO_COMPLETION_TOKEN_FOR(void()) CompletionToken>
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ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) post(
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ASIO_MOVE_ARG(CompletionToken) token)
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{
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return async_initiate<CompletionToken, void()>(
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detail::initiate_post(), token);
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}
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template <typename Executor,
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ASIO_COMPLETION_TOKEN_FOR(void()) CompletionToken>
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ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) post(
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const Executor& ex, ASIO_MOVE_ARG(CompletionToken) token,
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typename constraint<
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execution::is_executor<Executor>::value || is_executor<Executor>::value
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>::type)
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{
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return async_initiate<CompletionToken, void()>(
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detail::initiate_post_with_executor<Executor>(ex), token);
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}
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template <typename ExecutionContext,
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ASIO_COMPLETION_TOKEN_FOR(void()) CompletionToken>
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inline ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) post(
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ExecutionContext& ctx, ASIO_MOVE_ARG(CompletionToken) token,
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typename constraint<is_convertible<
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ExecutionContext&, execution_context&>::value>::type)
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{
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return async_initiate<CompletionToken, void()>(
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detail::initiate_post_with_executor<
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typename ExecutionContext::executor_type>(
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ctx.get_executor()), token);
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}
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_IMPL_POST_HPP
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