1 //
2 // detail/win_iocp_wait_op.hpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6 //
7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9 //
10 
11 #ifndef BOOST_ASIO_DETAIL_WIN_IOCP_WAIT_OP_HPP
12 #define BOOST_ASIO_DETAIL_WIN_IOCP_WAIT_OP_HPP
13 
14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
15 # pragma once
16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
17 
18 #include <boost/asio/detail/config.hpp>
19 
20 #if defined(BOOST_ASIO_HAS_IOCP)
21 
22 #include <boost/asio/detail/bind_handler.hpp>
23 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
24 #include <boost/asio/detail/fenced_block.hpp>
25 #include <boost/asio/detail/handler_alloc_helpers.hpp>
26 #include <boost/asio/detail/handler_invoke_helpers.hpp>
27 #include <boost/asio/detail/handler_work.hpp>
28 #include <boost/asio/detail/memory.hpp>
29 #include <boost/asio/detail/reactor_op.hpp>
30 #include <boost/asio/detail/socket_ops.hpp>
31 #include <boost/asio/error.hpp>
32 
33 #include <boost/asio/detail/push_options.hpp>
34 
35 namespace boost {
36 namespace asio {
37 namespace detail {
38 
39 template <typename Handler, typename IoExecutor>
40 class win_iocp_wait_op : public reactor_op
41 {
42 public:
43   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_wait_op);
44 
win_iocp_wait_op(socket_ops::weak_cancel_token_type cancel_token,Handler & handler,const IoExecutor & io_ex)45   win_iocp_wait_op(socket_ops::weak_cancel_token_type cancel_token,
46       Handler& handler, const IoExecutor& io_ex)
47     : reactor_op(boost::system::error_code(),
48         &win_iocp_wait_op::do_perform,
49         &win_iocp_wait_op::do_complete),
50       cancel_token_(cancel_token),
51       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
52       work_(handler_, io_ex)
53   {
54   }
55 
do_perform(reactor_op *)56   static status do_perform(reactor_op*)
57   {
58     return done;
59   }
60 
do_complete(void * owner,operation * base,const boost::system::error_code & result_ec,std::size_t)61   static void do_complete(void* owner, operation* base,
62       const boost::system::error_code& result_ec,
63       std::size_t /*bytes_transferred*/)
64   {
65     boost::system::error_code ec(result_ec);
66 
67     // Take ownership of the operation object.
68     win_iocp_wait_op* o(static_cast<win_iocp_wait_op*>(base));
69     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
70 
71     BOOST_ASIO_HANDLER_COMPLETION((*o));
72 
73     // Take ownership of the operation's outstanding work.
74     handler_work<Handler, IoExecutor> w(
75         BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
76           o->work_));
77 
78     // The reactor may have stored a result in the operation object.
79     if (o->ec_)
80       ec = o->ec_;
81 
82     // Map non-portable errors to their portable counterparts.
83     if (ec.value() == ERROR_NETNAME_DELETED)
84     {
85       if (o->cancel_token_.expired())
86         ec = boost::asio::error::operation_aborted;
87       else
88         ec = boost::asio::error::connection_reset;
89     }
90     else if (ec.value() == ERROR_PORT_UNREACHABLE)
91     {
92       ec = boost::asio::error::connection_refused;
93     }
94 
95     // Make a copy of the handler so that the memory can be deallocated before
96     // the upcall is made. Even if we're not about to make an upcall, a
97     // sub-object of the handler may be the true owner of the memory associated
98     // with the handler. Consequently, a local copy of the handler is required
99     // to ensure that any owning sub-object remains valid until after we have
100     // deallocated the memory here.
101     detail::binder1<Handler, boost::system::error_code>
102       handler(o->handler_, ec);
103     p.h = boost::asio::detail::addressof(handler.handler_);
104     p.reset();
105 
106     // Make the upcall if required.
107     if (owner)
108     {
109       fenced_block b(fenced_block::half);
110       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_));
111       w.complete(handler, handler.handler_);
112       BOOST_ASIO_HANDLER_INVOCATION_END;
113     }
114   }
115 
116 private:
117   socket_ops::weak_cancel_token_type cancel_token_;
118   Handler handler_;
119   handler_work<Handler, IoExecutor> work_;
120 };
121 
122 } // namespace detail
123 } // namespace asio
124 } // namespace boost
125 
126 #include <boost/asio/detail/pop_options.hpp>
127 
128 #endif // defined(BOOST_ASIO_HAS_IOCP)
129 
130 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_WAIT_OP_HPP
131