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1 | // |
2 | // detail/reactive_socket_recvfrom_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_RECVFROM_OP_HPP | |
12 | #define BOOST_ASIO_DETAIL_REACTIVE_SOCKET_RECVFROM_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, typename Endpoint> | |
33 | class reactive_socket_recvfrom_op_base : public reactor_op | |
34 | { | |
35 | public: | |
36 | reactive_socket_recvfrom_op_base(socket_type socket, int protocol_type, | |
37 | const MutableBufferSequence& buffers, Endpoint& endpoint, | |
38 | socket_base::message_flags flags, func_type complete_func) | |
39 | : reactor_op(&reactive_socket_recvfrom_op_base::do_perform, complete_func), | |
40 | socket_(socket), | |
41 | protocol_type_(protocol_type), | |
42 | buffers_(buffers), | |
43 | sender_endpoint_(endpoint), | |
44 | flags_(flags) | |
45 | { | |
46 | } | |
47 | ||
48 | static bool do_perform(reactor_op* base) | |
49 | { | |
50 | reactive_socket_recvfrom_op_base* o( | |
51 | static_cast<reactive_socket_recvfrom_op_base*>(base)); | |
52 | ||
53 | buffer_sequence_adapter<boost::asio::mutable_buffer, | |
54 | MutableBufferSequence> bufs(o->buffers_); | |
55 | ||
56 | std::size_t addr_len = o->sender_endpoint_.capacity(); | |
57 | bool result = socket_ops::non_blocking_recvfrom(o->socket_, | |
58 | bufs.buffers(), bufs.count(), o->flags_, | |
59 | o->sender_endpoint_.data(), &addr_len, | |
60 | o->ec_, o->bytes_transferred_); | |
61 | ||
62 | if (result && !o->ec_) | |
63 | o->sender_endpoint_.resize(addr_len); | |
64 | ||
65 | return result; | |
66 | } | |
67 | ||
68 | private: | |
69 | socket_type socket_; | |
70 | int protocol_type_; | |
71 | MutableBufferSequence buffers_; | |
72 | Endpoint& sender_endpoint_; | |
73 | socket_base::message_flags flags_; | |
74 | }; | |
75 | ||
76 | template <typename MutableBufferSequence, typename Endpoint, typename Handler> | |
77 | class reactive_socket_recvfrom_op : | |
78 | public reactive_socket_recvfrom_op_base<MutableBufferSequence, Endpoint> | |
79 | { | |
80 | public: | |
81 | BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_socket_recvfrom_op); | |
82 | ||
83 | reactive_socket_recvfrom_op(socket_type socket, int protocol_type, | |
84 | const MutableBufferSequence& buffers, Endpoint& endpoint, | |
85 | socket_base::message_flags flags, Handler& handler) | |
86 | : reactive_socket_recvfrom_op_base<MutableBufferSequence, Endpoint>( | |
87 | socket, protocol_type, buffers, endpoint, flags, | |
88 | &reactive_socket_recvfrom_op::do_complete), | |
89 | handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)) | |
90 | { | |
91 | } | |
92 | ||
93 | static void do_complete(io_service_impl* owner, operation* base, | |
94 | const boost::system::error_code& /*ec*/, | |
95 | std::size_t /*bytes_transferred*/) | |
96 | { | |
97 | // Take ownership of the handler object. | |
98 | reactive_socket_recvfrom_op* o( | |
99 | static_cast<reactive_socket_recvfrom_op*>(base)); | |
100 | ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; | |
101 | ||
102 | BOOST_ASIO_HANDLER_COMPLETION((o)); | |
103 | ||
104 | // Make a copy of the handler so that the memory can be deallocated before | |
105 | // the upcall is made. Even if we're not about to make an upcall, a | |
106 | // sub-object of the handler may be the true owner of the memory associated | |
107 | // with the handler. Consequently, a local copy of the handler is required | |
108 | // to ensure that any owning sub-object remains valid until after we have | |
109 | // deallocated the memory here. | |
110 | detail::binder2<Handler, boost::system::error_code, std::size_t> | |
111 | handler(o->handler_, o->ec_, o->bytes_transferred_); | |
112 | p.h = boost::asio::detail::addressof(handler.handler_); | |
113 | p.reset(); | |
114 | ||
115 | // Make the upcall if required. | |
116 | if (owner) | |
117 | { | |
118 | fenced_block b(fenced_block::half); | |
119 | BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); | |
120 | boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_); | |
121 | BOOST_ASIO_HANDLER_INVOCATION_END; | |
122 | } | |
123 | } | |
124 | ||
125 | private: | |
126 | Handler handler_; | |
127 | }; | |
128 | ||
129 | } // namespace detail | |
130 | } // namespace asio | |
131 | } // namespace boost | |
132 | ||
133 | #include <boost/asio/detail/pop_options.hpp> | |
134 | ||
135 | #endif // BOOST_ASIO_DETAIL_REACTIVE_SOCKET_RECVFROM_OP_HPP |