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1 | // |
2 | // detail/descriptor_read_op.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
11fdf7f2 | 5 | // Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
7c673cae FG |
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_READ_OP_HPP | |
12 | #define BOOST_ASIO_DETAIL_DESCRIPTOR_READ_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 | ||
7c673cae FG |
22 | #include <boost/asio/detail/bind_handler.hpp> |
23 | #include <boost/asio/detail/buffer_sequence_adapter.hpp> | |
24 | #include <boost/asio/detail/descriptor_ops.hpp> | |
25 | #include <boost/asio/detail/fenced_block.hpp> | |
b32b8144 FG |
26 | #include <boost/asio/detail/handler_work.hpp> |
27 | #include <boost/asio/detail/memory.hpp> | |
7c673cae FG |
28 | #include <boost/asio/detail/reactor_op.hpp> |
29 | ||
30 | #include <boost/asio/detail/push_options.hpp> | |
31 | ||
32 | namespace boost { | |
33 | namespace asio { | |
34 | namespace detail { | |
35 | ||
36 | template <typename MutableBufferSequence> | |
37 | class descriptor_read_op_base : public reactor_op | |
38 | { | |
39 | public: | |
40 | descriptor_read_op_base(int descriptor, | |
41 | const MutableBufferSequence& buffers, func_type complete_func) | |
42 | : reactor_op(&descriptor_read_op_base::do_perform, complete_func), | |
43 | descriptor_(descriptor), | |
44 | buffers_(buffers) | |
45 | { | |
46 | } | |
47 | ||
b32b8144 | 48 | static status do_perform(reactor_op* base) |
7c673cae FG |
49 | { |
50 | descriptor_read_op_base* o(static_cast<descriptor_read_op_base*>(base)); | |
51 | ||
52 | buffer_sequence_adapter<boost::asio::mutable_buffer, | |
53 | MutableBufferSequence> bufs(o->buffers_); | |
54 | ||
b32b8144 FG |
55 | status result = descriptor_ops::non_blocking_read(o->descriptor_, |
56 | bufs.buffers(), bufs.count(), o->ec_, o->bytes_transferred_) | |
57 | ? done : not_done; | |
58 | ||
59 | BOOST_ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_read", | |
60 | o->ec_, o->bytes_transferred_)); | |
61 | ||
62 | return result; | |
7c673cae FG |
63 | } |
64 | ||
65 | private: | |
66 | int descriptor_; | |
67 | MutableBufferSequence buffers_; | |
68 | }; | |
69 | ||
70 | template <typename MutableBufferSequence, typename Handler> | |
71 | class descriptor_read_op | |
72 | : public descriptor_read_op_base<MutableBufferSequence> | |
73 | { | |
74 | public: | |
75 | BOOST_ASIO_DEFINE_HANDLER_PTR(descriptor_read_op); | |
76 | ||
77 | descriptor_read_op(int descriptor, | |
78 | const MutableBufferSequence& buffers, Handler& handler) | |
79 | : descriptor_read_op_base<MutableBufferSequence>( | |
80 | descriptor, buffers, &descriptor_read_op::do_complete), | |
81 | handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)) | |
82 | { | |
b32b8144 | 83 | handler_work<Handler>::start(handler_); |
7c673cae FG |
84 | } |
85 | ||
b32b8144 | 86 | static void do_complete(void* owner, operation* base, |
7c673cae FG |
87 | const boost::system::error_code& /*ec*/, |
88 | std::size_t /*bytes_transferred*/) | |
89 | { | |
90 | // Take ownership of the handler object. | |
91 | descriptor_read_op* o(static_cast<descriptor_read_op*>(base)); | |
92 | ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; | |
b32b8144 | 93 | handler_work<Handler> w(o->handler_); |
7c673cae | 94 | |
b32b8144 | 95 | BOOST_ASIO_HANDLER_COMPLETION((*o)); |
7c673cae FG |
96 | |
97 | // Make a copy of the handler so that the memory can be deallocated before | |
98 | // the upcall is made. Even if we're not about to make an upcall, a | |
99 | // sub-object of the handler may be the true owner of the memory associated | |
100 | // with the handler. Consequently, a local copy of the handler is required | |
101 | // to ensure that any owning sub-object remains valid until after we have | |
102 | // deallocated the memory here. | |
103 | detail::binder2<Handler, boost::system::error_code, std::size_t> | |
104 | handler(o->handler_, o->ec_, o->bytes_transferred_); | |
105 | p.h = boost::asio::detail::addressof(handler.handler_); | |
106 | p.reset(); | |
107 | ||
108 | // Make the upcall if required. | |
109 | if (owner) | |
110 | { | |
111 | fenced_block b(fenced_block::half); | |
112 | BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); | |
b32b8144 | 113 | w.complete(handler, handler.handler_); |
7c673cae FG |
114 | BOOST_ASIO_HANDLER_INVOCATION_END; |
115 | } | |
116 | } | |
117 | ||
118 | private: | |
119 | Handler handler_; | |
120 | }; | |
121 | ||
122 | } // namespace detail | |
123 | } // namespace asio | |
124 | } // namespace boost | |
125 | ||
126 | #include <boost/asio/detail/pop_options.hpp> | |
127 | ||
128 | #endif // !defined(BOOST_ASIO_WINDOWS) && !defined(__CYGWIN__) | |
129 | ||
130 | #endif // BOOST_ASIO_DETAIL_DESCRIPTOR_READ_OP_HPP |