asio/detail/win_iocp_wait_op.hpp

0001 //
0002 // detail/win_iocp_wait_op.hpp
0003 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
0004 //
0005 // Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
0006 //
0007 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0008 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0009 //
0010
0011 #ifndef BOOST_ASIO_DETAIL_WIN_IOCP_WAIT_OP_HPP
0012 #define BOOST_ASIO_DETAIL_WIN_IOCP_WAIT_OP_HPP
0013
0014 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
0015 # pragma once
0016 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
0017
0018 #include <boost/asio/detail/config.hpp>
0019
0020 #if defined(BOOST_ASIO_HAS_IOCP)
0021
0022 #include <boost/asio/detail/bind_handler.hpp>
0023 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
0024 #include <boost/asio/detail/fenced_block.hpp>
0025 #include <boost/asio/detail/handler_alloc_helpers.hpp>
0026 #include <boost/asio/detail/handler_work.hpp>
0027 #include <boost/asio/detail/memory.hpp>
0028 #include <boost/asio/detail/reactor_op.hpp>
0029 #include <boost/asio/detail/socket_ops.hpp>
0030 #include <boost/asio/error.hpp>
0031
0032 #include <boost/asio/detail/push_options.hpp>
0033
0034 namespace boost {
0035 namespace asio {
0036 namespace detail {
0037
0038 template <typename Handler, typename IoExecutor>
0039 class win_iocp_wait_op : public reactor_op
0040 {
0041 public:
0042   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_wait_op);
0043
0044   win_iocp_wait_op(socket_ops::weak_cancel_token_type cancel_token,
0045       Handler& handler, const IoExecutor& io_ex)
0046     : reactor_op(boost::system::error_code(),
0047         &win_iocp_wait_op::do_perform,
0048         &win_iocp_wait_op::do_complete),
0049       cancel_token_(cancel_token),
0050       handler_(static_cast<Handler&&>(handler)),
0051       work_(handler_, io_ex)
0052   {
0053   }
0054
0055   static status do_perform(reactor_op*)
0056   {
0057     return done;
0058   }
0059
0060   static void do_complete(void* owner, operation* base,
0061       const boost::system::error_code& result_ec,
0062       std::size_t /*bytes_transferred*/)
0063   {
0064     boost::system::error_code ec(result_ec);
0065
0066     // Take ownership of the operation object.
0067     BOOST_ASIO_ASSUME(base != 0);
0068     win_iocp_wait_op* o(static_cast<win_iocp_wait_op*>(base));
0069     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
0070
0071     BOOST_ASIO_HANDLER_COMPLETION((*o));
0072
0073     // Take ownership of the operation's outstanding work.
0074     handler_work<Handler, IoExecutor> w(
0075         static_cast<handler_work<Handler, IoExecutor>&&>(
0076           o->work_));
0077
0078     // The reactor may have stored a result in the operation object.
0079     if (o->ec_)
0080       ec = o->ec_;
0081
0082     // Map non-portable errors to their portable counterparts.
0083     if (ec.value() == ERROR_NETNAME_DELETED)
0084     {
0085       if (o->cancel_token_.expired())
0086         ec = boost::asio::error::operation_aborted;
0087       else
0088         ec = boost::asio::error::connection_reset;
0089     }
0090     else if (ec.value() == ERROR_PORT_UNREACHABLE)
0091     {
0092       ec = boost::asio::error::connection_refused;
0093     }
0094
0095     BOOST_ASIO_ERROR_LOCATION(ec);
0096
0097     // Make a copy of the handler so that the memory can be deallocated before
0098     // the upcall is made. Even if we're not about to make an upcall, a
0099     // sub-object of the handler may be the true owner of the memory associated
0100     // with the handler. Consequently, a local copy of the handler is required
0101     // to ensure that any owning sub-object remains valid until after we have
0102     // deallocated the memory here.
0103     detail::binder1<Handler, boost::system::error_code>
0104       handler(o->handler_, ec);
0105     p.h = boost::asio::detail::addressof(handler.handler_);
0106     p.reset();
0107
0108     // Make the upcall if required.
0109     if (owner)
0110     {
0111       fenced_block b(fenced_block::half);
0112       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_));
0113       w.complete(handler, handler.handler_);
0114       BOOST_ASIO_HANDLER_INVOCATION_END;
0115     }
0116   }
0117
0118 private:
0119   socket_ops::weak_cancel_token_type cancel_token_;
0120   Handler handler_;
0121   handler_work<Handler, IoExecutor> work_;
0122 };
0123
0124 } // namespace detail
0125 } // namespace asio
0126 } // namespace boost
0127
0128 #include <boost/asio/detail/pop_options.hpp>
0129
0130 #endif // defined(BOOST_ASIO_HAS_IOCP)
0131
0132 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_WAIT_OP_HPP