1 //
2 // detail/win_iocp_socket_recv_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_SOCKET_RECV_OP_HPP
12 #define BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECV_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/operation.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 MutableBufferSequence, typename Handler>
39 class win_iocp_socket_recv_op : public operation
40 {
41 public:
42   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_recv_op);
43 
win_iocp_socket_recv_op(socket_ops::state_type state,socket_ops::weak_cancel_token_type cancel_token,const MutableBufferSequence & buffers,Handler & handler)44   win_iocp_socket_recv_op(socket_ops::state_type state,
45       socket_ops::weak_cancel_token_type cancel_token,
46       const MutableBufferSequence& buffers, Handler& handler)
47     : operation(&win_iocp_socket_recv_op::do_complete),
48       state_(state),
49       cancel_token_(cancel_token),
50       buffers_(buffers),
51       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
52   {
53   }
54 
do_complete(io_service_impl * owner,operation * base,const boost::system::error_code & result_ec,std::size_t bytes_transferred)55   static void do_complete(io_service_impl* owner, operation* base,
56       const boost::system::error_code& result_ec,
57       std::size_t bytes_transferred)
58   {
59     boost::system::error_code ec(result_ec);
60 
61     // Take ownership of the operation object.
62     win_iocp_socket_recv_op* o(static_cast<win_iocp_socket_recv_op*>(base));
63     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
64 
65     BOOST_ASIO_HANDLER_COMPLETION((o));
66 
67 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
68     // Check whether buffers are still valid.
69     if (owner)
70     {
71       buffer_sequence_adapter<boost::asio::mutable_buffer,
72           MutableBufferSequence>::validate(o->buffers_);
73     }
74 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
75 
76     socket_ops::complete_iocp_recv(o->state_, o->cancel_token_,
77         buffer_sequence_adapter<boost::asio::mutable_buffer,
78           MutableBufferSequence>::all_empty(o->buffers_),
79         ec, bytes_transferred);
80 
81     // Make a copy of the handler so that the memory can be deallocated before
82     // the upcall is made. Even if we're not about to make an upcall, a
83     // sub-object of the handler may be the true owner of the memory associated
84     // with the handler. Consequently, a local copy of the handler is required
85     // to ensure that any owning sub-object remains valid until after we have
86     // deallocated the memory here.
87     detail::binder2<Handler, boost::system::error_code, std::size_t>
88       handler(o->handler_, ec, bytes_transferred);
89     p.h = boost::asio::detail::addressof(handler.handler_);
90     p.reset();
91 
92     // Make the upcall if required.
93     if (owner)
94     {
95       fenced_block b(fenced_block::half);
96       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
97       boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
98       BOOST_ASIO_HANDLER_INVOCATION_END;
99     }
100   }
101 
102 private:
103   socket_ops::state_type state_;
104   socket_ops::weak_cancel_token_type cancel_token_;
105   MutableBufferSequence buffers_;
106   Handler handler_;
107 };
108 
109 } // namespace detail
110 } // namespace asio
111 } // namespace boost
112 
113 #include <boost/asio/detail/pop_options.hpp>
114 
115 #endif // defined(BOOST_ASIO_HAS_IOCP)
116 
117 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECV_OP_HPP
118