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

source code of boost/boost/asio/detail/descriptor_write_op.hpp