121 lines
3.6 KiB
C++
121 lines
3.6 KiB
C++
//
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// experimental/detail/channel_receive_op.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2023 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_EXPERIMENTAL_DETAIL_CHANNEL_RECEIVE_OP_HPP
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#define ASIO_EXPERIMENTAL_DETAIL_CHANNEL_RECEIVE_OP_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/detail/bind_handler.hpp"
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#include "asio/detail/handler_alloc_helpers.hpp"
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#include "asio/error.hpp"
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#include "asio/experimental/detail/channel_handler.hpp"
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#include "asio/experimental/detail/channel_operation.hpp"
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#include "asio/experimental/detail/channel_payload.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace experimental {
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namespace detail {
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template <typename Payload>
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class channel_receive : public channel_operation
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{
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public:
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void immediate(Payload payload)
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{
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func_(this, immediate_op, &payload);
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}
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void complete(Payload payload)
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{
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func_(this, complete_op, &payload);
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}
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protected:
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channel_receive(func_type func)
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: channel_operation(func)
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{
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}
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};
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template <typename Payload, typename Handler, typename IoExecutor>
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class channel_receive_op : public channel_receive<Payload>
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{
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public:
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ASIO_DEFINE_HANDLER_PTR(channel_receive_op);
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template <typename... Args>
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channel_receive_op(Handler& handler, const IoExecutor& io_ex)
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: channel_receive<Payload>(&channel_receive_op::do_action),
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handler_(ASIO_MOVE_CAST(Handler)(handler)),
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work_(handler_, io_ex)
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{
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}
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static void do_action(channel_operation* base,
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channel_operation::action a, void* v)
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{
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// Take ownership of the operation object.
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channel_receive_op* o(static_cast<channel_receive_op*>(base));
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ptr p = { asio::detail::addressof(o->handler_), o, o };
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ASIO_HANDLER_COMPLETION((*o));
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// Take ownership of the operation's outstanding work.
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channel_operation::handler_work<Handler, IoExecutor> w(
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ASIO_MOVE_CAST2(channel_operation::handler_work<
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Handler, IoExecutor>)(o->work_));
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// Make a copy of the handler so that the memory can be deallocated before
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// the handler is posted. Even if we're not about to post the handler, a
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// sub-object of the handler may be the true owner of the memory associated
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// with the handler. Consequently, a local copy of the handler is required
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// to ensure that any owning sub-object remains valid until after we have
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// deallocated the memory here.
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if (a != channel_operation::destroy_op)
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{
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Payload* payload = static_cast<Payload*>(v);
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channel_handler<Payload, Handler> handler(
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ASIO_MOVE_CAST(Payload)(*payload), o->handler_);
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p.h = asio::detail::addressof(handler.handler_);
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p.reset();
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ASIO_HANDLER_INVOCATION_BEGIN(());
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if (a == channel_operation::immediate_op)
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w.immediate(handler, handler.handler_, 0);
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else
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w.complete(handler, handler.handler_);
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ASIO_HANDLER_INVOCATION_END;
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}
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else
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{
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asio::detail::binder0<Handler> handler(o->handler_);
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p.h = asio::detail::addressof(handler.handler_);
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p.reset();
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}
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}
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private:
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Handler handler_;
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channel_operation::handler_work<Handler, IoExecutor> work_;
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};
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} // namespace detail
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} // namespace experimental
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_EXPERIMENTAL_DETAIL_CHANNEL_RECEIVE_OP_HPP
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