204 lines
6.7 KiB
C++
Executable File
204 lines
6.7 KiB
C++
Executable File
//
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// detail/io_uring_socket_recvfrom_op.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2022 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 BOOST_ASIO_DETAIL_IO_URING_SOCKET_RECVFROM_OP_HPP
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#define BOOST_ASIO_DETAIL_IO_URING_SOCKET_RECVFROM_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 <boost/asio/detail/config.hpp>
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#if defined(BOOST_ASIO_HAS_IO_URING)
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#include <boost/asio/detail/bind_handler.hpp>
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#include <boost/asio/detail/buffer_sequence_adapter.hpp>
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#include <boost/asio/detail/socket_ops.hpp>
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#include <boost/asio/detail/fenced_block.hpp>
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#include <boost/asio/detail/handler_work.hpp>
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#include <boost/asio/detail/io_uring_operation.hpp>
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#include <boost/asio/detail/memory.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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namespace detail {
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template <typename MutableBufferSequence, typename Endpoint>
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class io_uring_socket_recvfrom_op_base : public io_uring_operation
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{
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public:
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io_uring_socket_recvfrom_op_base(const boost::system::error_code& success_ec,
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socket_type socket, socket_ops::state_type state,
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const MutableBufferSequence& buffers, Endpoint& endpoint,
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socket_base::message_flags flags, func_type complete_func)
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: io_uring_operation(success_ec,
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&io_uring_socket_recvfrom_op_base::do_prepare,
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&io_uring_socket_recvfrom_op_base::do_perform, complete_func),
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socket_(socket),
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state_(state),
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buffers_(buffers),
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sender_endpoint_(endpoint),
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flags_(flags),
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bufs_(buffers),
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msghdr_()
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{
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msghdr_.msg_iov = bufs_.buffers();
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msghdr_.msg_iovlen = static_cast<int>(bufs_.count());
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msghdr_.msg_name = static_cast<sockaddr*>(
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static_cast<void*>(sender_endpoint_.data()));
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msghdr_.msg_namelen = sender_endpoint_.capacity();
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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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io_uring_socket_recvfrom_op_base* o(
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static_cast<io_uring_socket_recvfrom_op_base*>(base));
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if ((o->state_ & socket_ops::internal_non_blocking) != 0)
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{
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bool except_op = (o->flags_ & socket_base::message_out_of_band) != 0;
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::io_uring_prep_poll_add(sqe, o->socket_, except_op ? POLLPRI : POLLIN);
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}
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else
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{
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::io_uring_prep_recvmsg(sqe, o->socket_, &o->msghdr_, o->flags_);
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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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io_uring_socket_recvfrom_op_base* o(
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static_cast<io_uring_socket_recvfrom_op_base*>(base));
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if ((o->state_ & socket_ops::internal_non_blocking) != 0)
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{
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bool except_op = (o->flags_ & socket_base::message_out_of_band) != 0;
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if (after_completion || !except_op)
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{
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std::size_t addr_len = o->sender_endpoint_.capacity();
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bool result;
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if (o->bufs_.is_single_buffer)
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{
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result = socket_ops::non_blocking_recvfrom1(o->socket_,
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o->bufs_.first(o->buffers_).data(),
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o->bufs_.first(o->buffers_).size(), o->flags_,
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o->sender_endpoint_.data(), &addr_len,
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o->ec_, o->bytes_transferred_);
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}
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else
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{
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result = socket_ops::non_blocking_recvfrom(o->socket_,
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o->bufs_.buffers(), o->bufs_.count(), o->flags_,
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o->sender_endpoint_.data(), &addr_len,
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o->ec_, o->bytes_transferred_);
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}
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if (result && !o->ec_)
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o->sender_endpoint_.resize(addr_len);
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}
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}
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else if (after_completion && !o->ec_)
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o->sender_endpoint_.resize(o->msghdr_.msg_namelen);
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if (o->ec_ && o->ec_ == boost::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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return after_completion;
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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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MutableBufferSequence buffers_;
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Endpoint& sender_endpoint_;
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socket_base::message_flags flags_;
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buffer_sequence_adapter<boost::asio::mutable_buffer,
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MutableBufferSequence> bufs_;
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msghdr msghdr_;
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};
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template <typename MutableBufferSequence, typename Endpoint,
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typename Handler, typename IoExecutor>
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class io_uring_socket_recvfrom_op
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: public io_uring_socket_recvfrom_op_base<MutableBufferSequence, Endpoint>
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{
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public:
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BOOST_ASIO_DEFINE_HANDLER_PTR(io_uring_socket_recvfrom_op);
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io_uring_socket_recvfrom_op(const boost::system::error_code& success_ec,
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int socket, socket_ops::state_type state,
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const MutableBufferSequence& buffers, Endpoint& endpoint,
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socket_base::message_flags flags,
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Handler& handler, const IoExecutor& io_ex)
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: io_uring_socket_recvfrom_op_base<MutableBufferSequence, Endpoint>(
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success_ec, socket, state, buffers, endpoint, flags,
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&io_uring_socket_recvfrom_op::do_complete),
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handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
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work_(handler_, io_ex)
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{
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}
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static void do_complete(void* owner, operation* base,
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const boost::system::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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io_uring_socket_recvfrom_op* o
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(static_cast<io_uring_socket_recvfrom_op*>(base));
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ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
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BOOST_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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BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
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o->work_));
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// Make a copy of the handler so that the memory can be deallocated before
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// the 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::binder2<Handler, boost::system::error_code, std::size_t>
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handler(o->handler_, o->ec_, o->bytes_transferred_);
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p.h = boost::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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BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
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w.complete(handler, handler.handler_);
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BOOST_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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} // namespace detail
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // defined(BOOST_ASIO_HAS_IO_URING)
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#endif // BOOST_ASIO_DETAIL_IO_URING_SOCKET_RECVFROM_OP_HPP
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