417 lines
14 KiB
C++
417 lines
14 KiB
C++
//
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// detail/reactive_descriptor_service.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_REACTIVE_DESCRIPTOR_SERVICE_HPP
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#define ASIO_DETAIL_REACTIVE_DESCRIPTOR_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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#if !defined(ASIO_WINDOWS) \
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&& !defined(ASIO_WINDOWS_RUNTIME) \
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&& !defined(__CYGWIN__)
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#include "asio/buffer.hpp"
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#include "asio/execution_context.hpp"
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#include "asio/detail/bind_handler.hpp"
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#include "asio/detail/buffer_sequence_adapter.hpp"
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#include "asio/detail/descriptor_ops.hpp"
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#include "asio/detail/descriptor_read_op.hpp"
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#include "asio/detail/descriptor_write_op.hpp"
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#include "asio/detail/fenced_block.hpp"
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#include "asio/detail/memory.hpp"
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#include "asio/detail/noncopyable.hpp"
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#include "asio/detail/reactive_null_buffers_op.hpp"
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#include "asio/detail/reactive_wait_op.hpp"
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#include "asio/detail/reactor.hpp"
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#include "asio/posix/descriptor_base.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 reactive_descriptor_service :
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public execution_context_service_base<reactive_descriptor_service>
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{
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public:
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// The native type of a descriptor.
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typedef int native_handle_type;
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// The implementation type of the descriptor.
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class implementation_type
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: private asio::detail::noncopyable
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{
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public:
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// Default constructor.
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implementation_type()
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: descriptor_(-1),
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state_(0)
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{
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}
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private:
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// Only this service will have access to the internal values.
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friend class reactive_descriptor_service;
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// The native descriptor representation.
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int descriptor_;
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// The current state of the descriptor.
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descriptor_ops::state_type state_;
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// Per-descriptor data used by the reactor.
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reactor::per_descriptor_data reactor_data_;
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};
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// Constructor.
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ASIO_DECL reactive_descriptor_service(execution_context& context);
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// Destroy all user-defined handler objects owned by the service.
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ASIO_DECL void shutdown();
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// Construct a new descriptor implementation.
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ASIO_DECL void construct(implementation_type& impl);
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// Move-construct a new descriptor implementation.
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ASIO_DECL void move_construct(implementation_type& impl,
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implementation_type& other_impl) ASIO_NOEXCEPT;
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// Move-assign from another descriptor implementation.
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ASIO_DECL void move_assign(implementation_type& impl,
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reactive_descriptor_service& other_service,
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implementation_type& other_impl);
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// Destroy a descriptor implementation.
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ASIO_DECL void destroy(implementation_type& impl);
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// Assign a native descriptor to a descriptor implementation.
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ASIO_DECL asio::error_code assign(implementation_type& impl,
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const native_handle_type& native_descriptor,
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asio::error_code& ec);
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// Determine whether the descriptor is open.
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bool is_open(const implementation_type& impl) const
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{
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return impl.descriptor_ != -1;
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}
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// Destroy a descriptor implementation.
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ASIO_DECL asio::error_code close(implementation_type& impl,
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asio::error_code& ec);
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// Get the native descriptor representation.
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native_handle_type native_handle(const implementation_type& impl) const
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{
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return impl.descriptor_;
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}
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// Release ownership of the native descriptor representation.
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ASIO_DECL native_handle_type release(implementation_type& impl);
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// Cancel all operations associated with the descriptor.
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ASIO_DECL asio::error_code cancel(implementation_type& impl,
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asio::error_code& ec);
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// Perform an IO control command on the descriptor.
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template <typename IO_Control_Command>
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asio::error_code io_control(implementation_type& impl,
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IO_Control_Command& command, asio::error_code& ec)
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{
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descriptor_ops::ioctl(impl.descriptor_, impl.state_,
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command.name(), static_cast<ioctl_arg_type*>(command.data()), ec);
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return ec;
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}
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// Gets the non-blocking mode of the descriptor.
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bool non_blocking(const implementation_type& impl) const
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{
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return (impl.state_ & descriptor_ops::user_set_non_blocking) != 0;
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}
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// Sets the non-blocking mode of the descriptor.
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asio::error_code non_blocking(implementation_type& impl,
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bool mode, asio::error_code& ec)
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{
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descriptor_ops::set_user_non_blocking(
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impl.descriptor_, impl.state_, mode, ec);
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return ec;
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}
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// Gets the non-blocking mode of the native descriptor implementation.
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bool native_non_blocking(const implementation_type& impl) const
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{
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return (impl.state_ & descriptor_ops::internal_non_blocking) != 0;
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}
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// Sets the non-blocking mode of the native descriptor implementation.
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asio::error_code native_non_blocking(implementation_type& impl,
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bool mode, asio::error_code& ec)
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{
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descriptor_ops::set_internal_non_blocking(
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impl.descriptor_, impl.state_, mode, ec);
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return ec;
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}
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// Wait for the descriptor to become ready to read, ready to write, or to have
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// pending error conditions.
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asio::error_code wait(implementation_type& impl,
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posix::descriptor_base::wait_type w, asio::error_code& ec)
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{
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switch (w)
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{
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case posix::descriptor_base::wait_read:
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descriptor_ops::poll_read(impl.descriptor_, impl.state_, ec);
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break;
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case posix::descriptor_base::wait_write:
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descriptor_ops::poll_write(impl.descriptor_, impl.state_, ec);
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break;
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case posix::descriptor_base::wait_error:
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descriptor_ops::poll_error(impl.descriptor_, impl.state_, ec);
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break;
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default:
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ec = asio::error::invalid_argument;
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break;
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}
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return ec;
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}
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// Asynchronously wait for the descriptor to become ready to read, ready to
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// write, or to have pending error conditions.
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template <typename Handler, typename IoExecutor>
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void async_wait(implementation_type& impl,
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posix::descriptor_base::wait_type w,
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Handler& handler, const IoExecutor& io_ex)
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{
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bool is_continuation =
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asio_handler_cont_helpers::is_continuation(handler);
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// Allocate and construct an operation to wrap the handler.
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typedef reactive_wait_op<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(success_ec_, handler, io_ex);
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ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "descriptor",
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&impl, impl.descriptor_, "async_wait"));
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int op_type;
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switch (w)
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{
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case posix::descriptor_base::wait_read:
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op_type = reactor::read_op;
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break;
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case posix::descriptor_base::wait_write:
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op_type = reactor::write_op;
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break;
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case posix::descriptor_base::wait_error:
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op_type = reactor::except_op;
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break;
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default:
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p.p->ec_ = asio::error::invalid_argument;
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reactor_.post_immediate_completion(p.p, is_continuation);
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p.v = p.p = 0;
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return;
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}
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start_op(impl, op_type, p.p, is_continuation, false, false);
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p.v = p.p = 0;
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}
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// Write some data to the descriptor.
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template <typename ConstBufferSequence>
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size_t write_some(implementation_type& impl,
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const ConstBufferSequence& buffers, asio::error_code& ec)
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{
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typedef buffer_sequence_adapter<asio::const_buffer,
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ConstBufferSequence> bufs_type;
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if (bufs_type::is_single_buffer)
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{
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return descriptor_ops::sync_write1(impl.descriptor_,
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impl.state_, bufs_type::first(buffers).data(),
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bufs_type::first(buffers).size(), ec);
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}
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else
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{
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bufs_type bufs(buffers);
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return descriptor_ops::sync_write(impl.descriptor_, impl.state_,
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bufs.buffers(), bufs.count(), bufs.all_empty(), ec);
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}
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}
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// Wait until data can be written without blocking.
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size_t write_some(implementation_type& impl,
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const null_buffers&, asio::error_code& ec)
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{
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// Wait for descriptor to become ready.
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descriptor_ops::poll_write(impl.descriptor_, impl.state_, ec);
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return 0;
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}
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// Start an asynchronous write. The data being sent must be valid for the
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// lifetime of the asynchronous operation.
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template <typename ConstBufferSequence, typename Handler, typename IoExecutor>
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void async_write_some(implementation_type& impl,
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const ConstBufferSequence& buffers, Handler& handler,
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const IoExecutor& io_ex)
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{
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bool is_continuation =
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asio_handler_cont_helpers::is_continuation(handler);
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// Allocate and construct an operation to wrap the handler.
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typedef descriptor_write_op<ConstBufferSequence, 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(success_ec_, impl.descriptor_, buffers, handler, io_ex);
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ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "descriptor",
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&impl, impl.descriptor_, "async_write_some"));
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start_op(impl, reactor::write_op, p.p, is_continuation, true,
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buffer_sequence_adapter<asio::const_buffer,
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ConstBufferSequence>::all_empty(buffers));
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p.v = p.p = 0;
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}
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// Start an asynchronous wait until data can be written without blocking.
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template <typename Handler, typename IoExecutor>
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void async_write_some(implementation_type& impl,
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const null_buffers&, Handler& handler, const IoExecutor& io_ex)
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{
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bool is_continuation =
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asio_handler_cont_helpers::is_continuation(handler);
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// Allocate and construct an operation to wrap the handler.
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typedef reactive_null_buffers_op<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(success_ec_, handler, io_ex);
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ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "descriptor",
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&impl, impl.descriptor_, "async_write_some(null_buffers)"));
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start_op(impl, reactor::write_op, p.p, is_continuation, false, false);
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p.v = p.p = 0;
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}
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// Read some data from the stream. Returns the number of bytes read.
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template <typename MutableBufferSequence>
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size_t read_some(implementation_type& impl,
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const MutableBufferSequence& buffers, asio::error_code& ec)
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{
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typedef buffer_sequence_adapter<asio::mutable_buffer,
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MutableBufferSequence> bufs_type;
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if (bufs_type::is_single_buffer)
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{
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return descriptor_ops::sync_read1(impl.descriptor_,
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impl.state_, bufs_type::first(buffers).data(),
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bufs_type::first(buffers).size(), ec);
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}
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else
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{
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bufs_type bufs(buffers);
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return descriptor_ops::sync_read(impl.descriptor_, impl.state_,
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bufs.buffers(), bufs.count(), bufs.all_empty(), ec);
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}
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}
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// Wait until data can be read without blocking.
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size_t read_some(implementation_type& impl,
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const null_buffers&, asio::error_code& ec)
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{
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// Wait for descriptor to become ready.
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descriptor_ops::poll_read(impl.descriptor_, impl.state_, ec);
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return 0;
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}
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// Start an asynchronous read. The buffer for the data being read must be
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// valid for the lifetime of the asynchronous operation.
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template <typename MutableBufferSequence,
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typename Handler, typename IoExecutor>
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void async_read_some(implementation_type& impl,
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const MutableBufferSequence& buffers,
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Handler& handler, const IoExecutor& io_ex)
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{
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bool is_continuation =
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asio_handler_cont_helpers::is_continuation(handler);
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// Allocate and construct an operation to wrap the handler.
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typedef descriptor_read_op<MutableBufferSequence, 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(success_ec_, impl.descriptor_, buffers, handler, io_ex);
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ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "descriptor",
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&impl, impl.descriptor_, "async_read_some"));
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start_op(impl, reactor::read_op, p.p, is_continuation, true,
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buffer_sequence_adapter<asio::mutable_buffer,
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MutableBufferSequence>::all_empty(buffers));
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p.v = p.p = 0;
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}
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// Wait until data can be read without blocking.
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template <typename Handler, typename IoExecutor>
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void async_read_some(implementation_type& impl,
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const null_buffers&, Handler& handler, const IoExecutor& io_ex)
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{
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bool is_continuation =
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asio_handler_cont_helpers::is_continuation(handler);
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// Allocate and construct an operation to wrap the handler.
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typedef reactive_null_buffers_op<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(success_ec_, handler, io_ex);
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ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "descriptor",
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&impl, impl.descriptor_, "async_read_some(null_buffers)"));
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start_op(impl, reactor::read_op, p.p, is_continuation, false, false);
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p.v = p.p = 0;
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}
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private:
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// Start the asynchronous operation.
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ASIO_DECL void start_op(implementation_type& impl, int op_type,
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reactor_op* op, bool is_continuation, bool is_non_blocking, bool noop);
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// The selector that performs event demultiplexing for the service.
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reactor& reactor_;
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// Cached success value to avoid accessing category singleton.
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const asio::error_code success_ec_;
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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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#if defined(ASIO_HEADER_ONLY)
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# include "asio/detail/impl/reactive_descriptor_service.ipp"
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#endif // defined(ASIO_HEADER_ONLY)
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#endif // !defined(ASIO_WINDOWS)
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// && !defined(ASIO_WINDOWS_RUNTIME)
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// && !defined(__CYGWIN__)
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#endif // ASIO_DETAIL_REACTIVE_DESCRIPTOR_SERVICE_HPP
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