aboutsummaryrefslogtreecommitdiffstats
path: root/lib/asio/detail/descriptor_write_op.hpp
blob: a9ec2a97624728a0a559bf25d3f18a0e70361f80 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
//
// detail/descriptor_write_op.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP
#define ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/config.hpp"

#if !defined(ASIO_WINDOWS) && !defined(__CYGWIN__)

#include "asio/detail/bind_handler.hpp"
#include "asio/detail/buffer_sequence_adapter.hpp"
#include "asio/detail/descriptor_ops.hpp"
#include "asio/detail/fenced_block.hpp"
#include "asio/detail/handler_work.hpp"
#include "asio/detail/memory.hpp"
#include "asio/detail/reactor_op.hpp"

#include "asio/detail/push_options.hpp"

namespace asio {
namespace detail {

template <typename ConstBufferSequence>
class descriptor_write_op_base : public reactor_op
{
public:
  descriptor_write_op_base(int descriptor,
      const ConstBufferSequence& buffers, func_type complete_func)
    : reactor_op(&descriptor_write_op_base::do_perform, complete_func),
      descriptor_(descriptor),
      buffers_(buffers)
  {
  }

  static status do_perform(reactor_op* base)
  {
    descriptor_write_op_base* o(static_cast<descriptor_write_op_base*>(base));

    buffer_sequence_adapter<asio::const_buffer,
        ConstBufferSequence> bufs(o->buffers_);

    status result = descriptor_ops::non_blocking_write(o->descriptor_,
        bufs.buffers(), bufs.count(), o->ec_, o->bytes_transferred_)
      ? done : not_done;

    ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_write",
          o->ec_, o->bytes_transferred_));

    return result;
  }

private:
  int descriptor_;
  ConstBufferSequence buffers_;
};

template <typename ConstBufferSequence, typename Handler>
class descriptor_write_op
  : public descriptor_write_op_base<ConstBufferSequence>
{
public:
  ASIO_DEFINE_HANDLER_PTR(descriptor_write_op);

  descriptor_write_op(int descriptor,
      const ConstBufferSequence& buffers, Handler& handler)
    : descriptor_write_op_base<ConstBufferSequence>(
        descriptor, buffers, &descriptor_write_op::do_complete),
      handler_(ASIO_MOVE_CAST(Handler)(handler))
  {
    handler_work<Handler>::start(handler_);
  }

  static void do_complete(void* owner, operation* base,
      const asio::error_code& /*ec*/,
      std::size_t /*bytes_transferred*/)
  {
    // Take ownership of the handler object.
    descriptor_write_op* o(static_cast<descriptor_write_op*>(base));
    ptr p = { asio::detail::addressof(o->handler_), o, o };
    handler_work<Handler> w(o->handler_);

    ASIO_HANDLER_COMPLETION((*o));

    // Make a copy of the handler so that the memory can be deallocated before
    // the upcall is made. Even if we're not about to make an upcall, a
    // sub-object of the handler may be the true owner of the memory associated
    // with the handler. Consequently, a local copy of the handler is required
    // to ensure that any owning sub-object remains valid until after we have
    // deallocated the memory here.
    detail::binder2<Handler, asio::error_code, std::size_t>
      handler(o->handler_, o->ec_, o->bytes_transferred_);
    p.h = asio::detail::addressof(handler.handler_);
    p.reset();

    // Make the upcall if required.
    if (owner)
    {
      fenced_block b(fenced_block::half);
      ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
      w.complete(handler, handler.handler_);
      ASIO_HANDLER_INVOCATION_END;
    }
  }

private:
  Handler handler_;
};

} // namespace detail
} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // !defined(ASIO_WINDOWS) && !defined(__CYGWIN__)

#endif // ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP