1 //
2 // detail/win_iocp_null_buffers_op.hpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2015 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_NULL_BUFFERS_OP_HPP
12 #define BOOST_ASIO_DETAIL_WIN_IOCP_NULL_BUFFERS_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/addressof.hpp>
23 #include <boost/asio/detail/bind_handler.hpp>
24 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
25 #include <boost/asio/detail/fenced_block.hpp>
26 #include <boost/asio/detail/handler_alloc_helpers.hpp>
27 #include <boost/asio/detail/handler_invoke_helpers.hpp>
28 #include <boost/asio/detail/reactor_op.hpp>
29 #include <boost/asio/detail/socket_ops.hpp>
30 #include <boost/asio/error.hpp>
31 
32 #include <boost/asio/detail/push_options.hpp>
33 
34 namespace boost {
35 namespace asio {
36 namespace detail {
37 
38 template <typename Handler>
39 class win_iocp_null_buffers_op : public reactor_op
40 {
41 public:
42   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_null_buffers_op);
43 
win_iocp_null_buffers_op(socket_ops::weak_cancel_token_type cancel_token,Handler & handler)44   win_iocp_null_buffers_op(socket_ops::weak_cancel_token_type cancel_token,
45       Handler& handler)
46     : reactor_op(&win_iocp_null_buffers_op::do_perform,
47         &win_iocp_null_buffers_op::do_complete),
48       cancel_token_(cancel_token),
49       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
50   {
51   }
52 
do_perform(reactor_op *)53   static bool do_perform(reactor_op*)
54   {
55     return true;
56   }
57 
do_complete(io_service_impl * owner,operation * base,const boost::system::error_code & result_ec,std::size_t bytes_transferred)58   static void do_complete(io_service_impl* owner, operation* base,
59       const boost::system::error_code& result_ec,
60       std::size_t bytes_transferred)
61   {
62     boost::system::error_code ec(result_ec);
63 
64     // Take ownership of the operation object.
65     win_iocp_null_buffers_op* o(static_cast<win_iocp_null_buffers_op*>(base));
66     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
67 
68     BOOST_ASIO_HANDLER_COMPLETION((o));
69 
70     // The reactor may have stored a result in the operation object.
71     if (o->ec_)
72       ec = o->ec_;
73 
74     // Map non-portable errors to their portable counterparts.
75     if (ec.value() == ERROR_NETNAME_DELETED)
76     {
77       if (o->cancel_token_.expired())
78         ec = boost::asio::error::operation_aborted;
79       else
80         ec = boost::asio::error::connection_reset;
81     }
82     else if (ec.value() == ERROR_PORT_UNREACHABLE)
83     {
84       ec = boost::asio::error::connection_refused;
85     }
86 
87     // Make a copy of the handler so that the memory can be deallocated before
88     // the upcall is made. Even if we're not about to make an upcall, a
89     // sub-object of the handler may be the true owner of the memory associated
90     // with the handler. Consequently, a local copy of the handler is required
91     // to ensure that any owning sub-object remains valid until after we have
92     // deallocated the memory here.
93     detail::binder2<Handler, boost::system::error_code, std::size_t>
94       handler(o->handler_, ec, bytes_transferred);
95     p.h = boost::asio::detail::addressof(handler.handler_);
96     p.reset();
97 
98     // Make the upcall if required.
99     if (owner)
100     {
101       fenced_block b(fenced_block::half);
102       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
103       boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
104       BOOST_ASIO_HANDLER_INVOCATION_END;
105     }
106   }
107 
108 private:
109   socket_ops::weak_cancel_token_type cancel_token_;
110   Handler handler_;
111 };
112 
113 } // namespace detail
114 } // namespace asio
115 } // namespace boost
116 
117 #include <boost/asio/detail/pop_options.hpp>
118 
119 #endif // defined(BOOST_ASIO_HAS_IOCP)
120 
121 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_NULL_BUFFERS_OP_HPP
122