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 | |
31 | namespace boost { |
32 | namespace asio { |
33 | namespace detail { |
34 | |
35 | template <typename ConstBufferSequence> |
36 | class descriptor_write_op_base : public reactor_op |
37 | { |
38 | public: |
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 | |
58 | private: |
59 | int descriptor_; |
60 | ConstBufferSequence buffers_; |
61 | }; |
62 | |
63 | template <typename ConstBufferSequence, typename Handler> |
64 | class descriptor_write_op |
65 | : public descriptor_write_op_base<ConstBufferSequence> |
66 | { |
67 | public: |
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 | |
109 | private: |
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 | |