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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 ASIO_DETAIL_REACTIVE_SOCKET_SEND_OP_HPP
12 #define ASIO_DETAIL_REACTIVE_SOCKET_SEND_OP_HPP
13 
14 
15 #include "asio/detail/config.hpp"
16 #include "asio/detail/addressof.hpp"
17 #include "asio/detail/bind_handler.hpp"
18 #include "asio/detail/buffer_sequence_adapter.hpp"
19 #include "asio/detail/fenced_block.hpp"
20 #include "asio/detail/reactor_op.hpp"
21 #include "asio/detail/socket_ops.hpp"
22 
23 #include "asio/detail/push_options.hpp"
24 
25 namespace asio {
26 namespace detail {
27 
28 template <typename ConstBufferSequence>
29 class reactive_socket_send_op_base : public reactor_op
30 {
31 public:
reactive_socket_send_op_base(socket_type socket,const ConstBufferSequence & buffers,socket_base::message_flags flags,func_type complete_func)32   reactive_socket_send_op_base(socket_type socket,
33       const ConstBufferSequence& buffers,
34       socket_base::message_flags flags, func_type complete_func)
35     : reactor_op(&reactive_socket_send_op_base::do_perform, complete_func),
36       socket_(socket),
37       buffers_(buffers),
38       flags_(flags)
39   {
40   }
41 
do_perform(reactor_op * base)42   static bool do_perform(reactor_op* base)
43   {
44     reactive_socket_send_op_base* o(
45         static_cast<reactive_socket_send_op_base*>(base));
46 
47     buffer_sequence_adapter<asio::const_buffer,
48         ConstBufferSequence> bufs(o->buffers_);
49 
50     return socket_ops::non_blocking_send(o->socket_,
51           bufs.buffers(), bufs.count(), o->flags_,
52           o->ec_, o->bytes_transferred_);
53   }
54 
55 private:
56   socket_type socket_;
57   ConstBufferSequence buffers_;
58   socket_base::message_flags flags_;
59 };
60 
61 template <typename ConstBufferSequence, typename Handler>
62 class reactive_socket_send_op :
63   public reactive_socket_send_op_base<ConstBufferSequence>
64 {
65 public:
66   ASIO_DEFINE_HANDLER_PTR(reactive_socket_send_op);
67 
reactive_socket_send_op(socket_type socket,const ConstBufferSequence & buffers,socket_base::message_flags flags,Handler & handler)68   reactive_socket_send_op(socket_type socket,
69       const ConstBufferSequence& buffers,
70       socket_base::message_flags flags, Handler& handler)
71     : reactive_socket_send_op_base<ConstBufferSequence>(socket,
72         buffers, flags, &reactive_socket_send_op::do_complete),
73       handler_(ASIO_MOVE_CAST(Handler)(handler))
74   {
75   }
76 
do_complete(io_service_impl * owner,operation * base,const asio::error_code &,std::size_t)77   static void do_complete(io_service_impl* owner, operation* base,
78       const asio::error_code& /*ec*/,
79       std::size_t /*bytes_transferred*/)
80   {
81     // Take ownership of the handler object.
82     reactive_socket_send_op* o(static_cast<reactive_socket_send_op*>(base));
83     ptr p = { asio::detail::addressof(o->handler_), o, o };
84 
85     ASIO_HANDLER_COMPLETION((o));
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, asio::error_code, std::size_t>
94       handler(o->handler_, o->ec_, o->bytes_transferred_);
95     p.h = 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       ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
103       asio_handler_invoke_helpers::invoke(handler, handler.handler_);
104       ASIO_HANDLER_INVOCATION_END;
105     }
106   }
107 
108 private:
109   Handler handler_;
110 };
111 
112 } // namespace detail
113 } // namespace asio
114 
115 #include "asio/detail/pop_options.hpp"
116 
117 #endif // ASIO_DETAIL_REACTIVE_SOCKET_SEND_OP_HPP
118