1 | // |
2 | // detail/reactive_socket_recvfrom_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_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(s: o->socket_, |
58 | bufs: bufs.buffers(), count: bufs.count(), flags: o->flags_, |
59 | addr: o->sender_endpoint_.data(), addrlen: &addr_len, |
60 | ec&: o->ec_, bytes_transferred&: 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 |
136 | |