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
25namespace asio {
26namespace detail {
27
28template <typename ConstBufferSequence>
29class reactive_socket_send_op_base : public reactor_op
30{
31public:
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
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
55private:
56  socket_type socket_;
57  ConstBufferSequence buffers_;
58  socket_base::message_flags flags_;
59};
60
61template <typename ConstBufferSequence, typename Handler>
62class reactive_socket_send_op :
63  public reactive_socket_send_op_base<ConstBufferSequence>
64{
65public:
66  ASIO_DEFINE_HANDLER_PTR(reactive_socket_send_op);
67
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
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
108private:
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