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1 | // | |
2 | // detail/reactive_socket_recv_op.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2016 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_REACTIVE_SOCKET_RECV_OP_HPP | |
12 | #define BOOST_ASIO_DETAIL_REACTIVE_SOCKET_RECV_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 | #include <boost/asio/detail/addressof.hpp> | |
20 | #include <boost/asio/detail/bind_handler.hpp> | |
21 | #include <boost/asio/detail/buffer_sequence_adapter.hpp> | |
22 | #include <boost/asio/detail/fenced_block.hpp> | |
23 | #include <boost/asio/detail/reactor_op.hpp> | |
24 | #include <boost/asio/detail/socket_ops.hpp> | |
25 | ||
26 | #include <boost/asio/detail/push_options.hpp> | |
27 | ||
28 | namespace boost { | |
29 | namespace asio { | |
30 | namespace detail { | |
31 | ||
32 | template <typename MutableBufferSequence> | |
33 | class reactive_socket_recv_op_base : public reactor_op | |
34 | { | |
35 | public: | |
36 | reactive_socket_recv_op_base(socket_type socket, | |
37 | socket_ops::state_type state, const MutableBufferSequence& buffers, | |
38 | socket_base::message_flags flags, func_type complete_func) | |
39 | : reactor_op(&reactive_socket_recv_op_base::do_perform, complete_func), | |
40 | socket_(socket), | |
41 | state_(state), | |
42 | buffers_(buffers), | |
43 | flags_(flags) | |
44 | { | |
45 | } | |
46 | ||
47 | static bool do_perform(reactor_op* base) | |
48 | { | |
49 | reactive_socket_recv_op_base* o( | |
50 | static_cast<reactive_socket_recv_op_base*>(base)); | |
51 | ||
52 | buffer_sequence_adapter<boost::asio::mutable_buffer, | |
53 | MutableBufferSequence> bufs(o->buffers_); | |
54 | ||
55 | return socket_ops::non_blocking_recv(o->socket_, | |
56 | bufs.buffers(), bufs.count(), o->flags_, | |
57 | (o->state_ & socket_ops::stream_oriented) != 0, | |
58 | o->ec_, o->bytes_transferred_); | |
59 | } | |
60 | ||
61 | private: | |
62 | socket_type socket_; | |
63 | socket_ops::state_type state_; | |
64 | MutableBufferSequence buffers_; | |
65 | socket_base::message_flags flags_; | |
66 | }; | |
67 | ||
68 | template <typename MutableBufferSequence, typename Handler> | |
69 | class reactive_socket_recv_op : | |
70 | public reactive_socket_recv_op_base<MutableBufferSequence> | |
71 | { | |
72 | public: | |
73 | BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_socket_recv_op); | |
74 | ||
75 | reactive_socket_recv_op(socket_type socket, | |
76 | socket_ops::state_type state, const MutableBufferSequence& buffers, | |
77 | socket_base::message_flags flags, Handler& handler) | |
78 | : reactive_socket_recv_op_base<MutableBufferSequence>(socket, state, | |
79 | buffers, flags, &reactive_socket_recv_op::do_complete), | |
80 | handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)) | |
81 | { | |
82 | } | |
83 | ||
84 | static void do_complete(io_service_impl* owner, operation* base, | |
85 | const boost::system::error_code& /*ec*/, | |
86 | std::size_t /*bytes_transferred*/) | |
87 | { | |
88 | // Take ownership of the handler object. | |
89 | reactive_socket_recv_op* o(static_cast<reactive_socket_recv_op*>(base)); | |
90 | ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; | |
91 | ||
92 | BOOST_ASIO_HANDLER_COMPLETION((o)); | |
93 | ||
94 | // Make a copy of the handler so that the memory can be deallocated before | |
95 | // the upcall is made. Even if we're not about to make an upcall, a | |
96 | // sub-object of the handler may be the true owner of the memory associated | |
97 | // with the handler. Consequently, a local copy of the handler is required | |
98 | // to ensure that any owning sub-object remains valid until after we have | |
99 | // deallocated the memory here. | |
100 | detail::binder2<Handler, boost::system::error_code, std::size_t> | |
101 | handler(o->handler_, o->ec_, o->bytes_transferred_); | |
102 | p.h = boost::asio::detail::addressof(handler.handler_); | |
103 | p.reset(); | |
104 | ||
105 | // Make the upcall if required. | |
106 | if (owner) | |
107 | { | |
108 | fenced_block b(fenced_block::half); | |
109 | BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); | |
110 | boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_); | |
111 | BOOST_ASIO_HANDLER_INVOCATION_END; | |
112 | } | |
113 | } | |
114 | ||
115 | private: | |
116 | Handler handler_; | |
117 | }; | |
118 | ||
119 | } // namespace detail | |
120 | } // namespace asio | |
121 | } // namespace boost | |
122 | ||
123 | #include <boost/asio/detail/pop_options.hpp> | |
124 | ||
125 | #endif // BOOST_ASIO_DETAIL_REACTIVE_SOCKET_RECV_OP_HPP |