1 //
2 // detail/reactive_socket_send_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_REACTIVE_SOCKET_SEND_OP_HPP
12 #define BOOST_ASIO_DETAIL_REACTIVE_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 #include <boost/asio/detail/addressof.hpp>
20 #include <boost/asio/detail/bind_handler.hpp>
21 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
22 #include <boost/asio/detail/fenced_block.hpp>
23 #include <boost/asio/detail/reactor_op.hpp>
24 #include <boost/asio/detail/socket_ops.hpp>
25 
26 #include <boost/asio/detail/push_options.hpp>
27 
28 namespace boost {
29 namespace asio {
30 namespace detail {
31 
32 template <typename ConstBufferSequence>
33 class reactive_socket_send_op_base : public reactor_op
34 {
35 public:
reactive_socket_send_op_base(socket_type socket,const ConstBufferSequence & buffers,socket_base::message_flags flags,func_type complete_func)36   reactive_socket_send_op_base(socket_type socket,
37       const ConstBufferSequence& buffers,
38       socket_base::message_flags flags, func_type complete_func)
39     : reactor_op(&reactive_socket_send_op_base::do_perform, complete_func),
40       socket_(socket),
41       buffers_(buffers),
42       flags_(flags)
43   {
44   }
45 
do_perform(reactor_op * base)46   static bool do_perform(reactor_op* base)
47   {
48     reactive_socket_send_op_base* o(
49         static_cast<reactive_socket_send_op_base*>(base));
50 
51     buffer_sequence_adapter<boost::asio::const_buffer,
52         ConstBufferSequence> bufs(o->buffers_);
53 
54     return socket_ops::non_blocking_send(o->socket_,
55           bufs.buffers(), bufs.count(), o->flags_,
56           o->ec_, o->bytes_transferred_);
57   }
58 
59 private:
60   socket_type socket_;
61   ConstBufferSequence buffers_;
62   socket_base::message_flags flags_;
63 };
64 
65 template <typename ConstBufferSequence, typename Handler>
66 class reactive_socket_send_op :
67   public reactive_socket_send_op_base<ConstBufferSequence>
68 {
69 public:
70   BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_socket_send_op);
71 
reactive_socket_send_op(socket_type socket,const ConstBufferSequence & buffers,socket_base::message_flags flags,Handler & handler)72   reactive_socket_send_op(socket_type socket,
73       const ConstBufferSequence& buffers,
74       socket_base::message_flags flags, Handler& handler)
75     : reactive_socket_send_op_base<ConstBufferSequence>(socket,
76         buffers, flags, &reactive_socket_send_op::do_complete),
77       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
78   {
79   }
80 
do_complete(io_service_impl * owner,operation * base,const boost::system::error_code &,std::size_t)81   static void do_complete(io_service_impl* owner, operation* base,
82       const boost::system::error_code& /*ec*/,
83       std::size_t /*bytes_transferred*/)
84   {
85     // Take ownership of the handler object.
86     reactive_socket_send_op* o(static_cast<reactive_socket_send_op*>(base));
87     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
88 
89     BOOST_ASIO_HANDLER_COMPLETION((o));
90 
91     // Make a copy of the handler so that the memory can be deallocated before
92     // the upcall is made. Even if we're not about to make an upcall, a
93     // sub-object of the handler may be the true owner of the memory associated
94     // with the handler. Consequently, a local copy of the handler is required
95     // to ensure that any owning sub-object remains valid until after we have
96     // deallocated the memory here.
97     detail::binder2<Handler, boost::system::error_code, std::size_t>
98       handler(o->handler_, o->ec_, o->bytes_transferred_);
99     p.h = boost::asio::detail::addressof(handler.handler_);
100     p.reset();
101 
102     // Make the upcall if required.
103     if (owner)
104     {
105       fenced_block b(fenced_block::half);
106       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
107       boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
108       BOOST_ASIO_HANDLER_INVOCATION_END;
109     }
110   }
111 
112 private:
113   Handler handler_;
114 };
115 
116 } // namespace detail
117 } // namespace asio
118 } // namespace boost
119 
120 #include <boost/asio/detail/pop_options.hpp>
121 
122 #endif // BOOST_ASIO_DETAIL_REACTIVE_SOCKET_SEND_OP_HPP
123