1 //
2 // detail/win_iocp_socket_send_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_SOCKET_SEND_OP_HPP
12 #define BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_SEND_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/operation.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 ConstBufferSequence, typename Handler, typename IoExecutor>
40 class win_iocp_socket_send_op : public operation
41 {
42 public:
43   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_send_op);
44 
win_iocp_socket_send_op(socket_ops::weak_cancel_token_type cancel_token,const ConstBufferSequence & buffers,Handler & handler,const IoExecutor & io_ex)45   win_iocp_socket_send_op(socket_ops::weak_cancel_token_type cancel_token,
46       const ConstBufferSequence& buffers, Handler& handler,
47       const IoExecutor& io_ex)
48     : operation(&win_iocp_socket_send_op::do_complete),
49       cancel_token_(cancel_token),
50       buffers_(buffers),
51       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
52       work_(handler_, io_ex)
53   {
54   }
55 
do_complete(void * owner,operation * base,const boost::system::error_code & result_ec,std::size_t bytes_transferred)56   static void do_complete(void* owner, operation* base,
57       const boost::system::error_code& result_ec,
58       std::size_t bytes_transferred)
59   {
60     boost::system::error_code ec(result_ec);
61 
62     // Take ownership of the operation object.
63     win_iocp_socket_send_op* o(static_cast<win_iocp_socket_send_op*>(base));
64     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
65 
66     BOOST_ASIO_HANDLER_COMPLETION((*o));
67 
68     // Take ownership of the operation's outstanding work.
69     handler_work<Handler, IoExecutor> w(
70         BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
71           o->work_));
72 
73 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
74     // Check whether buffers are still valid.
75     if (owner)
76     {
77       buffer_sequence_adapter<boost::asio::const_buffer,
78           ConstBufferSequence>::validate(o->buffers_);
79     }
80 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
81 
82     socket_ops::complete_iocp_send(o->cancel_token_, ec);
83 
84     // Make a copy of the handler so that the memory can be deallocated before
85     // the upcall is made. Even if we're not about to make an upcall, a
86     // sub-object of the handler may be the true owner of the memory associated
87     // with the handler. Consequently, a local copy of the handler is required
88     // to ensure that any owning sub-object remains valid until after we have
89     // deallocated the memory here.
90     detail::binder2<Handler, boost::system::error_code, std::size_t>
91       handler(o->handler_, ec, bytes_transferred);
92     p.h = boost::asio::detail::addressof(handler.handler_);
93     p.reset();
94 
95     // Make the upcall if required.
96     if (owner)
97     {
98       fenced_block b(fenced_block::half);
99       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
100       w.complete(handler, handler.handler_);
101       BOOST_ASIO_HANDLER_INVOCATION_END;
102     }
103   }
104 
105 private:
106   socket_ops::weak_cancel_token_type cancel_token_;
107   ConstBufferSequence buffers_;
108   Handler handler_;
109   handler_work<Handler, IoExecutor> work_;
110 };
111 
112 } // namespace detail
113 } // namespace asio
114 } // namespace boost
115 
116 #include <boost/asio/detail/pop_options.hpp>
117 
118 #endif // defined(BOOST_ASIO_HAS_IOCP)
119 
120 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_SEND_OP_HPP
121