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include/asio/detail/io_uring_socket_accept_op.hpp
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280
include/asio/detail/io_uring_socket_accept_op.hpp
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//
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// detail/io_uring_socket_accept_op.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2025 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_SOCKET_ACCEPT_OP_HPP
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#define ASIO_DETAIL_IO_URING_SOCKET_ACCEPT_OP_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if defined(ASIO_HAS_IO_URING)
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#include "asio/detail/bind_handler.hpp"
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#include "asio/detail/fenced_block.hpp"
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#include "asio/detail/handler_alloc_helpers.hpp"
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#include "asio/detail/handler_work.hpp"
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#include "asio/detail/io_uring_operation.hpp"
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#include "asio/detail/memory.hpp"
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#include "asio/detail/socket_holder.hpp"
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#include "asio/detail/socket_ops.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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template <typename Socket, typename Protocol>
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class io_uring_socket_accept_op_base : public io_uring_operation
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{
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public:
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io_uring_socket_accept_op_base(const asio::error_code& success_ec,
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socket_type socket, socket_ops::state_type state, Socket& peer,
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const Protocol& protocol, typename Protocol::endpoint* peer_endpoint,
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func_type complete_func)
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: io_uring_operation(success_ec,
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&io_uring_socket_accept_op_base::do_prepare,
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&io_uring_socket_accept_op_base::do_perform, complete_func),
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socket_(socket),
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state_(state),
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peer_(peer),
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protocol_(protocol),
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peer_endpoint_(peer_endpoint),
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addrlen_(peer_endpoint ? peer_endpoint->capacity() : 0)
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{
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}
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static void do_prepare(io_uring_operation* base, ::io_uring_sqe* sqe)
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{
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ASIO_ASSUME(base != 0);
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io_uring_socket_accept_op_base* o(
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static_cast<io_uring_socket_accept_op_base*>(base));
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if ((o->state_ & socket_ops::internal_non_blocking) != 0)
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{
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::io_uring_prep_poll_add(sqe, o->socket_, POLLIN);
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}
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else
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{
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::io_uring_prep_accept(sqe, o->socket_,
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o->peer_endpoint_ ? o->peer_endpoint_->data() : 0,
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o->peer_endpoint_ ? &o->addrlen_ : 0, 0);
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}
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}
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static bool do_perform(io_uring_operation* base, bool after_completion)
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{
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ASIO_ASSUME(base != 0);
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io_uring_socket_accept_op_base* o(
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static_cast<io_uring_socket_accept_op_base*>(base));
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if ((o->state_ & socket_ops::internal_non_blocking) != 0)
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{
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socket_type new_socket = invalid_socket;
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std::size_t addrlen = static_cast<std::size_t>(o->addrlen_);
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bool result = socket_ops::non_blocking_accept(o->socket_,
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o->state_, o->peer_endpoint_ ? o->peer_endpoint_->data() : 0,
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o->peer_endpoint_ ? &addrlen : 0, o->ec_, new_socket);
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o->new_socket_.reset(new_socket);
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o->addrlen_ = static_cast<socklen_t>(addrlen);
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return result;
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}
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if (o->ec_ && o->ec_ == asio::error::would_block)
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{
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o->state_ |= socket_ops::internal_non_blocking;
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return false;
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}
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if (after_completion && !o->ec_)
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o->new_socket_.reset(static_cast<int>(o->bytes_transferred_));
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return after_completion;
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}
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void do_assign()
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{
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if (new_socket_.get() != invalid_socket)
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{
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if (peer_endpoint_)
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peer_endpoint_->resize(addrlen_);
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peer_.assign(protocol_, new_socket_.get(), ec_);
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if (!ec_)
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new_socket_.release();
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}
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}
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private:
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socket_type socket_;
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socket_ops::state_type state_;
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socket_holder new_socket_;
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Socket& peer_;
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Protocol protocol_;
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typename Protocol::endpoint* peer_endpoint_;
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socklen_t addrlen_;
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};
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template <typename Socket, typename Protocol,
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typename Handler, typename IoExecutor>
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class io_uring_socket_accept_op :
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public io_uring_socket_accept_op_base<Socket, Protocol>
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{
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public:
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ASIO_DEFINE_HANDLER_PTR(io_uring_socket_accept_op);
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io_uring_socket_accept_op(const asio::error_code& success_ec,
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socket_type socket, socket_ops::state_type state, Socket& peer,
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const Protocol& protocol, typename Protocol::endpoint* peer_endpoint,
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Handler& handler, const IoExecutor& io_ex)
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: io_uring_socket_accept_op_base<Socket, Protocol>(
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success_ec, socket, state, peer, protocol, peer_endpoint,
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&io_uring_socket_accept_op::do_complete),
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handler_(static_cast<Handler&&>(handler)),
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work_(handler_, io_ex)
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{
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}
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static void do_complete(void* owner, operation* base,
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const asio::error_code& /*ec*/,
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std::size_t /*bytes_transferred*/)
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{
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// Take ownership of the handler object.
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ASIO_ASSUME(base != 0);
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io_uring_socket_accept_op* o(static_cast<io_uring_socket_accept_op*>(base));
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ptr p = { asio::detail::addressof(o->handler_), o, o };
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// On success, assign new connection to peer socket object.
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if (owner)
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o->do_assign();
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ASIO_HANDLER_COMPLETION((*o));
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// Take ownership of the operation's outstanding work.
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handler_work<Handler, IoExecutor> w(
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static_cast<handler_work<Handler, IoExecutor>&&>(
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o->work_));
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ASIO_ERROR_LOCATION(o->ec_);
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// Make a copy of the handler so that the memory can be deallocated before
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// the upcall is made. Even if we're not about to make an upcall, a
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// sub-object of the handler may be the true owner of the memory associated
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// with the handler. Consequently, a local copy of the handler is required
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// to ensure that any owning sub-object remains valid until after we have
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// deallocated the memory here.
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detail::binder1<Handler, asio::error_code>
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handler(o->handler_, o->ec_);
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p.h = asio::detail::addressof(handler.handler_);
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p.reset();
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// Make the upcall if required.
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if (owner)
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{
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fenced_block b(fenced_block::half);
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ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_));
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w.complete(handler, handler.handler_);
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ASIO_HANDLER_INVOCATION_END;
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}
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}
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private:
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Handler handler_;
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handler_work<Handler, IoExecutor> work_;
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};
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template <typename Protocol, typename PeerIoExecutor,
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typename Handler, typename IoExecutor>
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class io_uring_socket_move_accept_op :
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private Protocol::socket::template rebind_executor<PeerIoExecutor>::other,
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public io_uring_socket_accept_op_base<
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typename Protocol::socket::template rebind_executor<PeerIoExecutor>::other,
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Protocol>
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{
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public:
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ASIO_DEFINE_HANDLER_PTR(io_uring_socket_move_accept_op);
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io_uring_socket_move_accept_op(const asio::error_code& success_ec,
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const PeerIoExecutor& peer_io_ex, socket_type socket,
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socket_ops::state_type state, const Protocol& protocol,
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typename Protocol::endpoint* peer_endpoint, Handler& handler,
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const IoExecutor& io_ex)
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: peer_socket_type(peer_io_ex),
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io_uring_socket_accept_op_base<peer_socket_type, Protocol>(
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success_ec, socket, state, *this, protocol, peer_endpoint,
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&io_uring_socket_move_accept_op::do_complete),
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handler_(static_cast<Handler&&>(handler)),
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work_(handler_, io_ex)
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{
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}
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static void do_complete(void* owner, operation* base,
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const asio::error_code& /*ec*/,
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std::size_t /*bytes_transferred*/)
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{
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// Take ownership of the handler object.
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ASIO_ASSUME(base != 0);
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io_uring_socket_move_accept_op* o(
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static_cast<io_uring_socket_move_accept_op*>(base));
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ptr p = { asio::detail::addressof(o->handler_), o, o };
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// On success, assign new connection to peer socket object.
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if (owner)
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o->do_assign();
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ASIO_HANDLER_COMPLETION((*o));
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// Take ownership of the operation's outstanding work.
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handler_work<Handler, IoExecutor> w(
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static_cast<handler_work<Handler, IoExecutor>&&>(
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o->work_));
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ASIO_ERROR_LOCATION(o->ec_);
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// Make a copy of the handler so that the memory can be deallocated before
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// the upcall is made. Even if we're not about to make an upcall, a
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// sub-object of the handler may be the true owner of the memory associated
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// with the handler. Consequently, a local copy of the handler is required
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// to ensure that any owning sub-object remains valid until after we have
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// deallocated the memory here.
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detail::move_binder2<Handler,
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asio::error_code, peer_socket_type>
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handler(0, static_cast<Handler&&>(o->handler_), o->ec_,
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static_cast<peer_socket_type&&>(*o));
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p.h = asio::detail::addressof(handler.handler_);
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p.reset();
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// Make the upcall if required.
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if (owner)
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{
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fenced_block b(fenced_block::half);
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ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, "..."));
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w.complete(handler, handler.handler_);
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ASIO_HANDLER_INVOCATION_END;
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}
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}
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private:
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typedef typename Protocol::socket::template
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rebind_executor<PeerIoExecutor>::other peer_socket_type;
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Handler handler_;
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handler_work<Handler, IoExecutor> work_;
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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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#endif // defined(ASIO_HAS_IO_URING)
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#endif // ASIO_DETAIL_IO_URING_SOCKET_ACCEPT_OP_HPP
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