678 lines
19 KiB
C++
678 lines
19 KiB
C++
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//
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// experimental/detail/channel_service.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_SERVICE_HPP
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#define ASIO_EXPERIMENTAL_DETAIL_CHANNEL_SERVICE_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_cancellation_slot.hpp"
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#include "asio/cancellation_type.hpp"
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#include "asio/detail/mutex.hpp"
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#include "asio/detail/op_queue.hpp"
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#include "asio/execution_context.hpp"
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#include "asio/experimental/detail/channel_message.hpp"
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#include "asio/experimental/detail/channel_receive_op.hpp"
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#include "asio/experimental/detail/channel_send_op.hpp"
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#include "asio/experimental/detail/has_signature.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 Mutex>
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class channel_service
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: public asio::detail::execution_context_service_base<
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channel_service<Mutex> >
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{
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public:
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// Possible states for a channel end.
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enum state
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{
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buffer = 0,
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waiter = 1,
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block = 2,
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closed = 3
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};
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// The base implementation type of all channels.
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struct base_implementation_type
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{
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// Default constructor.
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base_implementation_type()
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: receive_state_(block),
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send_state_(block),
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max_buffer_size_(0),
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next_(0),
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prev_(0)
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{
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}
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// The current state of the channel.
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state receive_state_ : 16;
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state send_state_ : 16;
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// The maximum number of elements that may be buffered in the channel.
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std::size_t max_buffer_size_;
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// The operations that are waiting on the channel.
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asio::detail::op_queue<channel_operation> waiters_;
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// Pointers to adjacent channel implementations in linked list.
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base_implementation_type* next_;
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base_implementation_type* prev_;
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// The mutex type to protect the internal implementation.
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mutable Mutex mutex_;
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};
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// The implementation for a specific value type.
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template <typename Traits, typename... Signatures>
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struct implementation_type;
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// Constructor.
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channel_service(execution_context& ctx);
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// Destroy all user-defined handler objects owned by the service.
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void shutdown();
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// Construct a new channel implementation.
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void construct(base_implementation_type& impl, std::size_t max_buffer_size);
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// Destroy a channel implementation.
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template <typename Traits, typename... Signatures>
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void destroy(implementation_type<Traits, Signatures...>& impl);
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// Move-construct a new channel implementation.
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template <typename Traits, typename... Signatures>
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void move_construct(implementation_type<Traits, Signatures...>& impl,
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implementation_type<Traits, Signatures...>& other_impl);
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// Move-assign from another channel implementation.
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template <typename Traits, typename... Signatures>
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void move_assign(implementation_type<Traits, Signatures...>& impl,
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channel_service& other_service,
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implementation_type<Traits, Signatures...>& other_impl);
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// Get the capacity of the channel.
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std::size_t capacity(
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const base_implementation_type& impl) const ASIO_NOEXCEPT;
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// Determine whether the channel is open.
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bool is_open(const base_implementation_type& impl) const ASIO_NOEXCEPT;
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// Reset the channel to its initial state.
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template <typename Traits, typename... Signatures>
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void reset(implementation_type<Traits, Signatures...>& impl);
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// Close the channel.
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template <typename Traits, typename... Signatures>
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void close(implementation_type<Traits, Signatures...>& impl);
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// Cancel all operations associated with the channel.
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template <typename Traits, typename... Signatures>
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void cancel(implementation_type<Traits, Signatures...>& impl);
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// Cancel the operation associated with the channel that has the given key.
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template <typename Traits, typename... Signatures>
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void cancel_by_key(implementation_type<Traits, Signatures...>& impl,
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void* cancellation_key);
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// Determine whether a value can be read from the channel without blocking.
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bool ready(const base_implementation_type& impl) const ASIO_NOEXCEPT;
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// Synchronously send a new value into the channel.
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template <typename Message, typename Traits,
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typename... Signatures, typename... Args>
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bool try_send(implementation_type<Traits, Signatures...>& impl,
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ASIO_MOVE_ARG(Args)... args);
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// Synchronously send a number of new values into the channel.
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template <typename Message, typename Traits,
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typename... Signatures, typename... Args>
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std::size_t try_send_n(implementation_type<Traits, Signatures...>& impl,
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std::size_t count, ASIO_MOVE_ARG(Args)... args);
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// Asynchronously send a new value into the channel.
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template <typename Traits, typename... Signatures,
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typename Handler, typename IoExecutor>
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void async_send(implementation_type<Traits, Signatures...>& impl,
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ASIO_MOVE_ARG2(typename implementation_type<
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Traits, Signatures...>::payload_type) payload,
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Handler& handler, const IoExecutor& io_ex)
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{
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typename associated_cancellation_slot<Handler>::type slot
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= asio::get_associated_cancellation_slot(handler);
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// Allocate and construct an operation to wrap the handler.
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typedef channel_send_op<
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typename implementation_type<Traits, Signatures...>::payload_type,
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Handler, IoExecutor> op;
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typename op::ptr p = { asio::detail::addressof(handler),
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op::ptr::allocate(handler), 0 };
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p.p = new (p.v) op(ASIO_MOVE_CAST2(typename implementation_type<
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Traits, Signatures...>::payload_type)(payload), handler, io_ex);
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// Optionally register for per-operation cancellation.
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if (slot.is_connected())
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{
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p.p->cancellation_key_ =
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&slot.template emplace<op_cancellation<Traits, Signatures...> >(
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this, &impl);
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}
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ASIO_HANDLER_CREATION((this->context(), *p.p,
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"channel", &impl, 0, "async_send"));
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start_send_op(impl, p.p);
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p.v = p.p = 0;
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}
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// Synchronously receive a value from the channel.
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template <typename Traits, typename... Signatures, typename Handler>
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bool try_receive(implementation_type<Traits, Signatures...>& impl,
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ASIO_MOVE_ARG(Handler) handler);
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// Asynchronously receive a value from the channel.
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template <typename Traits, typename... Signatures,
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typename Handler, typename IoExecutor>
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void async_receive(implementation_type<Traits, Signatures...>& impl,
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Handler& handler, const IoExecutor& io_ex)
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{
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typename associated_cancellation_slot<Handler>::type slot
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= asio::get_associated_cancellation_slot(handler);
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// Allocate and construct an operation to wrap the handler.
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typedef channel_receive_op<
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typename implementation_type<Traits, Signatures...>::payload_type,
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Handler, IoExecutor> op;
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typename op::ptr p = { asio::detail::addressof(handler),
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op::ptr::allocate(handler), 0 };
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p.p = new (p.v) op(handler, io_ex);
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// Optionally register for per-operation cancellation.
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if (slot.is_connected())
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{
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p.p->cancellation_key_ =
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&slot.template emplace<op_cancellation<Traits, Signatures...> >(
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this, &impl);
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}
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ASIO_HANDLER_CREATION((this->context(), *p.p,
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"channel", &impl, 0, "async_receive"));
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start_receive_op(impl, p.p);
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p.v = p.p = 0;
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}
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private:
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// Helper function object to handle a closed notification.
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template <typename Payload, typename Signature>
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struct complete_receive
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{
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explicit complete_receive(channel_receive<Payload>* op)
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: op_(op)
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{
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}
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template <typename... Args>
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void operator()(ASIO_MOVE_ARG(Args)... args)
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{
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op_->complete(
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channel_message<Signature>(0,
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ASIO_MOVE_CAST(Args)(args)...));
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}
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channel_receive<Payload>* op_;
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};
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// Destroy a base channel implementation.
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void base_destroy(base_implementation_type& impl);
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// Helper function to start an asynchronous put operation.
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template <typename Traits, typename... Signatures>
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void start_send_op(implementation_type<Traits, Signatures...>& impl,
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channel_send<typename implementation_type<
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Traits, Signatures...>::payload_type>* send_op);
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// Helper function to start an asynchronous get operation.
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template <typename Traits, typename... Signatures>
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void start_receive_op(implementation_type<Traits, Signatures...>& impl,
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channel_receive<typename implementation_type<
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Traits, Signatures...>::payload_type>* receive_op);
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// Helper class used to implement per-operation cancellation.
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template <typename Traits, typename... Signatures>
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class op_cancellation
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{
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public:
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op_cancellation(channel_service* s,
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implementation_type<Traits, Signatures...>* impl)
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: service_(s),
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impl_(impl)
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{
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}
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void operator()(cancellation_type_t type)
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{
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if (!!(type &
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(cancellation_type::terminal
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| cancellation_type::partial
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| cancellation_type::total)))
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{
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service_->cancel_by_key(*impl_, this);
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}
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}
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private:
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channel_service* service_;
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implementation_type<Traits, Signatures...>* impl_;
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};
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// Mutex to protect access to the linked list of implementations.
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asio::detail::mutex mutex_;
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// The head of a linked list of all implementations.
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base_implementation_type* impl_list_;
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};
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// The implementation for a specific value type.
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template <typename Mutex>
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template <typename Traits, typename... Signatures>
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struct channel_service<Mutex>::implementation_type : base_implementation_type
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{
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// The traits type associated with the channel.
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typedef typename Traits::template rebind<Signatures...>::other traits_type;
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// Type of an element stored in the buffer.
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typedef typename conditional<
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has_signature<
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typename traits_type::receive_cancelled_signature,
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Signatures...
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>::value,
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typename conditional<
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has_signature<
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typename traits_type::receive_closed_signature,
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Signatures...
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>::value,
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channel_payload<Signatures...>,
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channel_payload<
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Signatures...,
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typename traits_type::receive_closed_signature
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>
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>::type,
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typename conditional<
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has_signature<
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typename traits_type::receive_closed_signature,
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Signatures...,
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typename traits_type::receive_cancelled_signature
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>::value,
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channel_payload<
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Signatures...,
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typename traits_type::receive_cancelled_signature
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>,
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channel_payload<
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Signatures...,
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typename traits_type::receive_cancelled_signature,
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typename traits_type::receive_closed_signature
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>
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>::type
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>::type payload_type;
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// Move from another buffer.
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void buffer_move_from(implementation_type& other)
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{
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buffer_ = ASIO_MOVE_CAST(
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typename traits_type::template container<
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payload_type>::type)(other.buffer_);
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other.buffer_clear();
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}
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// Get number of buffered elements.
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std::size_t buffer_size() const
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{
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return buffer_.size();
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}
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// Push a new value to the back of the buffer.
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void buffer_push(payload_type payload)
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{
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buffer_.push_back(ASIO_MOVE_CAST(payload_type)(payload));
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}
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// Push new values to the back of the buffer.
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std::size_t buffer_push_n(std::size_t count, payload_type payload)
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{
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std::size_t i = 0;
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for (; i < count && buffer_.size() < this->max_buffer_size_; ++i)
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buffer_.push_back(payload);
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return i;
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}
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// Get the element at the front of the buffer.
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payload_type buffer_front()
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{
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return ASIO_MOVE_CAST(payload_type)(buffer_.front());
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}
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// Pop a value from the front of the buffer.
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void buffer_pop()
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{
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buffer_.pop_front();
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}
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// Clear all buffered values.
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void buffer_clear()
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{
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buffer_.clear();
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}
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private:
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// Buffered values.
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typename traits_type::template container<payload_type>::type buffer_;
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};
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||
|
|
|
||
|
|
// The implementation for a void value type.
|
||
|
|
template <typename Mutex>
|
||
|
|
template <typename Traits, typename R>
|
||
|
|
struct channel_service<Mutex>::implementation_type<Traits, R()>
|
||
|
|
: channel_service::base_implementation_type
|
||
|
|
{
|
||
|
|
// The traits type associated with the channel.
|
||
|
|
typedef typename Traits::template rebind<R()>::other traits_type;
|
||
|
|
|
||
|
|
// Type of an element stored in the buffer.
|
||
|
|
typedef typename conditional<
|
||
|
|
has_signature<
|
||
|
|
typename traits_type::receive_cancelled_signature,
|
||
|
|
R()
|
||
|
|
>::value,
|
||
|
|
typename conditional<
|
||
|
|
has_signature<
|
||
|
|
typename traits_type::receive_closed_signature,
|
||
|
|
R()
|
||
|
|
>::value,
|
||
|
|
channel_payload<R()>,
|
||
|
|
channel_payload<
|
||
|
|
R(),
|
||
|
|
typename traits_type::receive_closed_signature
|
||
|
|
>
|
||
|
|
>::type,
|
||
|
|
typename conditional<
|
||
|
|
has_signature<
|
||
|
|
typename traits_type::receive_closed_signature,
|
||
|
|
R(),
|
||
|
|
typename traits_type::receive_cancelled_signature
|
||
|
|
>::value,
|
||
|
|
channel_payload<
|
||
|
|
R(),
|
||
|
|
typename traits_type::receive_cancelled_signature
|
||
|
|
>,
|
||
|
|
channel_payload<
|
||
|
|
R(),
|
||
|
|
typename traits_type::receive_cancelled_signature,
|
||
|
|
typename traits_type::receive_closed_signature
|
||
|
|
>
|
||
|
|
>::type
|
||
|
|
>::type payload_type;
|
||
|
|
|
||
|
|
// Construct with empty buffer.
|
||
|
|
implementation_type()
|
||
|
|
: buffer_(0)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
// Move from another buffer.
|
||
|
|
void buffer_move_from(implementation_type& other)
|
||
|
|
{
|
||
|
|
buffer_ = other.buffer_;
|
||
|
|
other.buffer_ = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get number of buffered elements.
|
||
|
|
std::size_t buffer_size() const
|
||
|
|
{
|
||
|
|
return buffer_;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Push a new value to the back of the buffer.
|
||
|
|
void buffer_push(payload_type)
|
||
|
|
{
|
||
|
|
++buffer_;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Push new values to the back of the buffer.
|
||
|
|
std::size_t buffer_push_n(std::size_t count, payload_type)
|
||
|
|
{
|
||
|
|
std::size_t available = this->max_buffer_size_ - buffer_;
|
||
|
|
count = (count < available) ? count : available;
|
||
|
|
buffer_ += count;
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get the element at the front of the buffer.
|
||
|
|
payload_type buffer_front()
|
||
|
|
{
|
||
|
|
return payload_type(channel_message<R()>(0));
|
||
|
|
}
|
||
|
|
|
||
|
|
// Pop a value from the front of the buffer.
|
||
|
|
void buffer_pop()
|
||
|
|
{
|
||
|
|
--buffer_;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Clear all values from the buffer.
|
||
|
|
void buffer_clear()
|
||
|
|
{
|
||
|
|
buffer_ = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
// Number of buffered "values".
|
||
|
|
std::size_t buffer_;
|
||
|
|
};
|
||
|
|
|
||
|
|
// The implementation for an error_code signature.
|
||
|
|
template <typename Mutex>
|
||
|
|
template <typename Traits, typename R>
|
||
|
|
struct channel_service<Mutex>::implementation_type<
|
||
|
|
Traits, R(asio::error_code)>
|
||
|
|
: channel_service::base_implementation_type
|
||
|
|
{
|
||
|
|
// The traits type associated with the channel.
|
||
|
|
typedef typename Traits::template rebind<R(asio::error_code)>::other
|
||
|
|
traits_type;
|
||
|
|
|
||
|
|
// Type of an element stored in the buffer.
|
||
|
|
typedef typename conditional<
|
||
|
|
has_signature<
|
||
|
|
typename traits_type::receive_cancelled_signature,
|
||
|
|
R(asio::error_code)
|
||
|
|
>::value,
|
||
|
|
typename conditional<
|
||
|
|
has_signature<
|
||
|
|
typename traits_type::receive_closed_signature,
|
||
|
|
R(asio::error_code)
|
||
|
|
>::value,
|
||
|
|
channel_payload<R(asio::error_code)>,
|
||
|
|
channel_payload<
|
||
|
|
R(asio::error_code),
|
||
|
|
typename traits_type::receive_closed_signature
|
||
|
|
>
|
||
|
|
>::type,
|
||
|
|
typename conditional<
|
||
|
|
has_signature<
|
||
|
|
typename traits_type::receive_closed_signature,
|
||
|
|
R(asio::error_code),
|
||
|
|
typename traits_type::receive_cancelled_signature
|
||
|
|
>::value,
|
||
|
|
channel_payload<
|
||
|
|
R(asio::error_code),
|
||
|
|
typename traits_type::receive_cancelled_signature
|
||
|
|
>,
|
||
|
|
channel_payload<
|
||
|
|
R(asio::error_code),
|
||
|
|
typename traits_type::receive_cancelled_signature,
|
||
|
|
typename traits_type::receive_closed_signature
|
||
|
|
>
|
||
|
|
>::type
|
||
|
|
>::type payload_type;
|
||
|
|
|
||
|
|
// Construct with empty buffer.
|
||
|
|
implementation_type()
|
||
|
|
: size_(0)
|
||
|
|
{
|
||
|
|
first_.count_ = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Move from another buffer.
|
||
|
|
void buffer_move_from(implementation_type& other)
|
||
|
|
{
|
||
|
|
size_ = other.buffer_;
|
||
|
|
other.size_ = 0;
|
||
|
|
first_ = other.first_;
|
||
|
|
other.first.count_ = 0;
|
||
|
|
rest_ = ASIO_MOVE_CAST(
|
||
|
|
typename traits_type::template container<
|
||
|
|
buffered_value>::type)(other.rest_);
|
||
|
|
other.buffer_clear();
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get number of buffered elements.
|
||
|
|
std::size_t buffer_size() const
|
||
|
|
{
|
||
|
|
return size_;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Push a new value to the back of the buffer.
|
||
|
|
void buffer_push(payload_type payload)
|
||
|
|
{
|
||
|
|
buffered_value& last = rest_.empty() ? first_ : rest_.back();
|
||
|
|
if (last.count_ == 0)
|
||
|
|
{
|
||
|
|
value_handler handler{last.value_};
|
||
|
|
payload.receive(handler);
|
||
|
|
last.count_ = 1;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
asio::error_code value{last.value_};
|
||
|
|
value_handler handler{value};
|
||
|
|
payload.receive(handler);
|
||
|
|
if (last.value_ == value)
|
||
|
|
++last.count_;
|
||
|
|
else
|
||
|
|
rest_.push_back({value, 1});
|
||
|
|
}
|
||
|
|
++size_;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Push new values to the back of the buffer.
|
||
|
|
std::size_t buffer_push_n(std::size_t count, payload_type payload)
|
||
|
|
{
|
||
|
|
std::size_t available = this->max_buffer_size_ - size_;
|
||
|
|
count = (count < available) ? count : available;
|
||
|
|
if (count > 0)
|
||
|
|
{
|
||
|
|
buffered_value& last = rest_.empty() ? first_ : rest_.back();
|
||
|
|
if (last.count_ == 0)
|
||
|
|
{
|
||
|
|
payload.receive(value_handler{last.value_});
|
||
|
|
last.count_ = count;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
asio::error_code value{last.value_};
|
||
|
|
payload.receive(value_handler{value});
|
||
|
|
if (last.value_ == value)
|
||
|
|
last.count_ += count;
|
||
|
|
else
|
||
|
|
rest_.push_back({value, count});
|
||
|
|
}
|
||
|
|
size_ += count;
|
||
|
|
}
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get the element at the front of the buffer.
|
||
|
|
payload_type buffer_front()
|
||
|
|
{
|
||
|
|
return payload_type({0, first_.value_});
|
||
|
|
}
|
||
|
|
|
||
|
|
// Pop a value from the front of the buffer.
|
||
|
|
void buffer_pop()
|
||
|
|
{
|
||
|
|
--size_;
|
||
|
|
if (--first_.count_ == 0 && !rest_.empty())
|
||
|
|
{
|
||
|
|
first_ = rest_.front();
|
||
|
|
rest_.pop_front();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Clear all values from the buffer.
|
||
|
|
void buffer_clear()
|
||
|
|
{
|
||
|
|
size_ = 0;
|
||
|
|
first_.count_ == 0;
|
||
|
|
rest_.clear();
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
struct buffered_value
|
||
|
|
{
|
||
|
|
asio::error_code value_;
|
||
|
|
std::size_t count_;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct value_handler
|
||
|
|
{
|
||
|
|
asio::error_code& target_;
|
||
|
|
|
||
|
|
template <typename... Args>
|
||
|
|
void operator()(const asio::error_code& value, Args&&...)
|
||
|
|
{
|
||
|
|
target_ = value;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
buffered_value& last_value()
|
||
|
|
{
|
||
|
|
return rest_.empty() ? first_ : rest_.back();
|
||
|
|
}
|
||
|
|
|
||
|
|
// Total number of buffered values.
|
||
|
|
std::size_t size_;
|
||
|
|
|
||
|
|
// The first buffered value is maintained as a separate data member to avoid
|
||
|
|
// allocating space in the container in the common case.
|
||
|
|
buffered_value first_;
|
||
|
|
|
||
|
|
// The rest of the buffered values.
|
||
|
|
typename traits_type::template container<buffered_value>::type rest_;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace detail
|
||
|
|
} // namespace experimental
|
||
|
|
} // namespace asio
|
||
|
|
|
||
|
|
#include "asio/detail/pop_options.hpp"
|
||
|
|
|
||
|
|
#include "asio/experimental/detail/impl/channel_service.hpp"
|
||
|
|
|
||
|
|
#endif // ASIO_EXPERIMENTAL_DETAIL_CHANNEL_SERVICE_HPP
|