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
28namespace boost {
29namespace asio {
30namespace detail {
31
32template <typename MutableBufferSequence, typename Endpoint>
33class reactive_socket_recvfrom_op_base : public reactor_op
34{
35public:
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
68private:
69 socket_type socket_;
70 int protocol_type_;
71 MutableBufferSequence buffers_;
72 Endpoint& sender_endpoint_;
73 socket_base::message_flags flags_;
74};
75
76template <typename MutableBufferSequence, typename Endpoint, typename Handler>
77class reactive_socket_recvfrom_op :
78 public reactive_socket_recvfrom_op_base<MutableBufferSequence, Endpoint>
79{
80public:
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
125private:
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

source code of boost/boost/asio/detail/reactive_socket_recvfrom_op.hpp