688 lines
23 KiB
C++
688 lines
23 KiB
C++
//
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// detail/io_uring_descriptor_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_DETAIL_IO_URING_DESCRIPTOR_SERVICE_HPP
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#define ASIO_DETAIL_IO_URING_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_HAS_IO_URING)
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#include "asio/associated_cancellation_slot.hpp"
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#include "asio/buffer.hpp"
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#include "asio/cancellation_type.hpp"
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#include "asio/execution_context.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/io_uring_descriptor_read_at_op.hpp"
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#include "asio/detail/io_uring_descriptor_read_op.hpp"
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#include "asio/detail/io_uring_descriptor_write_at_op.hpp"
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#include "asio/detail/io_uring_descriptor_write_op.hpp"
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#include "asio/detail/io_uring_null_buffers_op.hpp"
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#include "asio/detail/io_uring_service.hpp"
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#include "asio/detail/io_uring_wait_op.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/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 io_uring_descriptor_service :
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public execution_context_service_base<io_uring_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 io_uring_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 I/O object data used by the io_uring_service.
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io_uring_service::per_io_object_data io_object_data_;
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};
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// Constructor.
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ASIO_DECL io_uring_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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io_uring_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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// Release ownership of the native descriptor representation.
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native_handle_type release(implementation_type& impl,
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asio::error_code& ec)
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{
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ec = success_ec_;
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return release(impl);
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}
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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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ASIO_ERROR_LOCATION(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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ASIO_ERROR_LOCATION(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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ASIO_ERROR_LOCATION(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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ASIO_ERROR_LOCATION(ec);
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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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typename associated_cancellation_slot<Handler>::type slot
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= asio::get_associated_cancellation_slot(handler);
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int op_type;
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int poll_flags;
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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 = io_uring_service::read_op;
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poll_flags = POLLIN;
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break;
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case posix::descriptor_base::wait_write:
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op_type = io_uring_service::write_op;
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poll_flags = POLLOUT;
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break;
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case posix::descriptor_base::wait_error:
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op_type = io_uring_service::except_op;
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poll_flags = POLLPRI | POLLERR | POLLHUP;
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break;
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default:
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op_type = -1;
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poll_flags = -1;
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return;
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}
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// Allocate and construct an operation to wrap the handler.
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typedef io_uring_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_, impl.descriptor_,
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poll_flags, handler, io_ex);
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// Optionally register for per-operation cancellation.
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if (slot.is_connected() && op_type != -1)
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{
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p.p->cancellation_key_ =
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&slot.template emplace<io_uring_op_cancellation>(
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&io_uring_service_, &impl.io_object_data_, op_type);
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}
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ASIO_HANDLER_CREATION((io_uring_service_.context(), *p.p,
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"descriptor", &impl, impl.descriptor_, "async_wait"));
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start_op(impl, op_type, p.p, is_continuation, op_type == -1);
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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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size_t n;
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if (bufs_type::is_single_buffer)
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{
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n = 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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n = 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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ASIO_ERROR_LOCATION(ec);
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return n;
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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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ASIO_ERROR_LOCATION(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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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 io_uring_descriptor_write_op<
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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_,
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impl.state_, buffers, 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<io_uring_op_cancellation>(&io_uring_service_,
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&impl.io_object_data_, io_uring_service::write_op);
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}
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ASIO_HANDLER_CREATION((io_uring_service_.context(), *p.p,
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"descriptor", &impl, impl.descriptor_, "async_write_some"));
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start_op(impl, io_uring_service::write_op, p.p, is_continuation,
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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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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 io_uring_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_, impl.descriptor_, POLLOUT, 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<io_uring_op_cancellation>(&io_uring_service_,
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&impl.io_object_data_, io_uring_service::write_op);
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}
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ASIO_HANDLER_CREATION((io_uring_service_.context(),
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*p.p, "descriptor", &impl, impl.descriptor_,
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"async_write_some(null_buffers)"));
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start_op(impl, io_uring_service::write_op, p.p, is_continuation, false);
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p.v = p.p = 0;
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}
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// Write some data to the descriptor at the specified offset.
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template <typename ConstBufferSequence>
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size_t write_some_at(implementation_type& impl, uint64_t offset,
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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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size_t n;
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if (bufs_type::is_single_buffer)
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{
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n = descriptor_ops::sync_write_at1(impl.descriptor_,
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impl.state_, offset, 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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n = descriptor_ops::sync_write_at(impl.descriptor_, impl.state_,
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offset, bufs.buffers(), bufs.count(), bufs.all_empty(), ec);
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}
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ASIO_ERROR_LOCATION(ec);
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return n;
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}
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// Wait until data can be written without blocking.
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size_t write_some_at(implementation_type& impl, uint64_t,
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const null_buffers& buffers, asio::error_code& ec)
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{
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return write_some(impl, buffers, ec);
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}
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// Start an asynchronous write at the specified offset. The data being sent
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// must be valid for the lifetime of the asynchronous operation.
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template <typename ConstBufferSequence, typename Handler, typename IoExecutor>
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void async_write_some_at(implementation_type& impl, uint64_t offset,
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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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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 io_uring_descriptor_write_at_op<
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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_,
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impl.state_, offset, buffers, 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<io_uring_op_cancellation>(&io_uring_service_,
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&impl.io_object_data_, io_uring_service::write_op);
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}
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ASIO_HANDLER_CREATION((io_uring_service_.context(), *p.p,
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"descriptor", &impl, impl.descriptor_, "async_write_some"));
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start_op(impl, io_uring_service::write_op, p.p, is_continuation,
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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_at(implementation_type& impl,
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const null_buffers& buffers, Handler& handler, const IoExecutor& io_ex)
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{
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return async_write_some(impl, buffers, handler, io_ex);
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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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size_t n;
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if (bufs_type::is_single_buffer)
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{
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n = 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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n = 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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ASIO_ERROR_LOCATION(ec);
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return n;
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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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ASIO_ERROR_LOCATION(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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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 io_uring_descriptor_read_op<
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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_,
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impl.state_, buffers, 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<io_uring_op_cancellation>(&io_uring_service_,
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&impl.io_object_data_, io_uring_service::read_op);
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}
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ASIO_HANDLER_CREATION((io_uring_service_.context(), *p.p,
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"descriptor", &impl, impl.descriptor_, "async_read_some"));
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start_op(impl, io_uring_service::read_op, p.p, is_continuation,
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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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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 io_uring_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_, impl.descriptor_, POLLIN, handler, io_ex);
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|
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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<io_uring_op_cancellation>(&io_uring_service_,
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&impl.io_object_data_, io_uring_service::read_op);
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}
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ASIO_HANDLER_CREATION((io_uring_service_.context(),
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*p.p, "descriptor", &impl, impl.descriptor_,
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"async_read_some(null_buffers)"));
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start_op(impl, io_uring_service::read_op, p.p, is_continuation, false);
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p.v = p.p = 0;
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}
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// Read some data at the specified offset. Returns the number of bytes read.
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template <typename MutableBufferSequence>
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size_t read_some_at(implementation_type& impl, uint64_t offset,
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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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|
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if (bufs_type::is_single_buffer)
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{
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return descriptor_ops::sync_read_at1(impl.descriptor_,
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impl.state_, offset, 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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|
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return descriptor_ops::sync_read_at(impl.descriptor_, impl.state_,
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offset, bufs.buffers(), bufs.count(), bufs.all_empty(), ec);
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}
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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_at(implementation_type& impl, uint64_t,
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|
const null_buffers& buffers, asio::error_code& ec)
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|
{
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return read_some(impl, buffers, ec);
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}
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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_at(implementation_type& impl,
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|
uint64_t offset, const MutableBufferSequence& buffers,
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|
Handler& handler, const IoExecutor& io_ex)
|
|
{
|
|
bool is_continuation =
|
|
asio_handler_cont_helpers::is_continuation(handler);
|
|
|
|
typename associated_cancellation_slot<Handler>::type slot
|
|
= asio::get_associated_cancellation_slot(handler);
|
|
|
|
// Allocate and construct an operation to wrap the handler.
|
|
typedef io_uring_descriptor_read_at_op<
|
|
MutableBufferSequence, Handler, IoExecutor> op;
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|
typename op::ptr p = { asio::detail::addressof(handler),
|
|
op::ptr::allocate(handler), 0 };
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|
p.p = new (p.v) op(success_ec_, impl.descriptor_,
|
|
impl.state_, offset, buffers, handler, io_ex);
|
|
|
|
// Optionally register for per-operation cancellation.
|
|
if (slot.is_connected())
|
|
{
|
|
p.p->cancellation_key_ =
|
|
&slot.template emplace<io_uring_op_cancellation>(&io_uring_service_,
|
|
&impl.io_object_data_, io_uring_service::read_op);
|
|
}
|
|
|
|
ASIO_HANDLER_CREATION((io_uring_service_.context(), *p.p,
|
|
"descriptor", &impl, impl.descriptor_, "async_read_some"));
|
|
|
|
start_op(impl, io_uring_service::read_op, p.p, is_continuation,
|
|
buffer_sequence_adapter<asio::mutable_buffer,
|
|
MutableBufferSequence>::all_empty(buffers));
|
|
p.v = p.p = 0;
|
|
}
|
|
|
|
// Wait until data can be read without blocking.
|
|
template <typename Handler, typename IoExecutor>
|
|
void async_read_some_at(implementation_type& impl, uint64_t,
|
|
const null_buffers& buffers, Handler& handler, const IoExecutor& io_ex)
|
|
{
|
|
return async_read_some(impl, buffers, handler, io_ex);
|
|
}
|
|
|
|
private:
|
|
// Start the asynchronous operation.
|
|
ASIO_DECL void start_op(implementation_type& impl, int op_type,
|
|
io_uring_operation* op, bool is_continuation, bool noop);
|
|
|
|
// Helper class used to implement per-operation cancellation
|
|
class io_uring_op_cancellation
|
|
{
|
|
public:
|
|
io_uring_op_cancellation(io_uring_service* s,
|
|
io_uring_service::per_io_object_data* p, int o)
|
|
: io_uring_service_(s),
|
|
io_object_data_(p),
|
|
op_type_(o)
|
|
{
|
|
}
|
|
|
|
void operator()(cancellation_type_t type)
|
|
{
|
|
if (!!(type &
|
|
(cancellation_type::terminal
|
|
| cancellation_type::partial
|
|
| cancellation_type::total)))
|
|
{
|
|
io_uring_service_->cancel_ops_by_key(*io_object_data_, op_type_, this);
|
|
}
|
|
}
|
|
|
|
private:
|
|
io_uring_service* io_uring_service_;
|
|
io_uring_service::per_io_object_data* io_object_data_;
|
|
int op_type_;
|
|
};
|
|
|
|
// The io_uring_service that performs event demultiplexing for the service.
|
|
io_uring_service& io_uring_service_;
|
|
|
|
// Cached success value to avoid accessing category singleton.
|
|
const asio::error_code success_ec_;
|
|
};
|
|
|
|
} // namespace detail
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#if defined(ASIO_HEADER_ONLY)
|
|
# include "asio/detail/impl/io_uring_descriptor_service.ipp"
|
|
#endif // defined(ASIO_HEADER_ONLY)
|
|
|
|
#endif // defined(ASIO_HAS_IO_URING)
|
|
|
|
#endif // ASIO_DETAIL_IO_URING_DESCRIPTOR_SERVICE_HPP
|