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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 ASIO_DETAIL_REACTIVE_SOCKET_RECVFROM_OP_HPP
12 #define ASIO_DETAIL_REACTIVE_SOCKET_RECVFROM_OP_HPP
13 
14 
15 #include "asio/detail/config.hpp"
16 #include "asio/detail/addressof.hpp"
17 #include "asio/detail/bind_handler.hpp"
18 #include "asio/detail/buffer_sequence_adapter.hpp"
19 #include "asio/detail/fenced_block.hpp"
20 #include "asio/detail/reactor_op.hpp"
21 #include "asio/detail/socket_ops.hpp"
22 
23 #include "asio/detail/push_options.hpp"
24 
25 namespace asio {
26 namespace detail {
27 
28 template <typename MutableBufferSequence, typename Endpoint>
29 class reactive_socket_recvfrom_op_base : public reactor_op
30 {
31 public:
reactive_socket_recvfrom_op_base(socket_type socket,int protocol_type,const MutableBufferSequence & buffers,Endpoint & endpoint,socket_base::message_flags flags,func_type complete_func)32   reactive_socket_recvfrom_op_base(socket_type socket, int protocol_type,
33       const MutableBufferSequence& buffers, Endpoint& endpoint,
34       socket_base::message_flags flags, func_type complete_func)
35     : reactor_op(&reactive_socket_recvfrom_op_base::do_perform, complete_func),
36       socket_(socket),
37       protocol_type_(protocol_type),
38       buffers_(buffers),
39       sender_endpoint_(endpoint),
40       flags_(flags)
41   {
42   }
43 
do_perform(reactor_op * base)44   static bool do_perform(reactor_op* base)
45   {
46     reactive_socket_recvfrom_op_base* o(
47         static_cast<reactive_socket_recvfrom_op_base*>(base));
48 
49     buffer_sequence_adapter<asio::mutable_buffer,
50         MutableBufferSequence> bufs(o->buffers_);
51 
52     std::size_t addr_len = o->sender_endpoint_.capacity();
53     bool result = socket_ops::non_blocking_recvfrom(o->socket_,
54         bufs.buffers(), bufs.count(), o->flags_,
55         o->sender_endpoint_.data(), &addr_len,
56         o->ec_, o->bytes_transferred_);
57 
58     if (result && !o->ec_)
59       o->sender_endpoint_.resize(addr_len);
60 
61     return result;
62   }
63 
64 private:
65   socket_type socket_;
66   int protocol_type_;
67   MutableBufferSequence buffers_;
68   Endpoint& sender_endpoint_;
69   socket_base::message_flags flags_;
70 };
71 
72 template <typename MutableBufferSequence, typename Endpoint, typename Handler>
73 class reactive_socket_recvfrom_op :
74   public reactive_socket_recvfrom_op_base<MutableBufferSequence, Endpoint>
75 {
76 public:
77   ASIO_DEFINE_HANDLER_PTR(reactive_socket_recvfrom_op);
78 
reactive_socket_recvfrom_op(socket_type socket,int protocol_type,const MutableBufferSequence & buffers,Endpoint & endpoint,socket_base::message_flags flags,Handler & handler)79   reactive_socket_recvfrom_op(socket_type socket, int protocol_type,
80       const MutableBufferSequence& buffers, Endpoint& endpoint,
81       socket_base::message_flags flags, Handler& handler)
82     : reactive_socket_recvfrom_op_base<MutableBufferSequence, Endpoint>(
83         socket, protocol_type, buffers, endpoint, flags,
84         &reactive_socket_recvfrom_op::do_complete),
85       handler_(ASIO_MOVE_CAST(Handler)(handler))
86   {
87   }
88 
do_complete(io_service_impl * owner,operation * base,const asio::error_code &,std::size_t)89   static void do_complete(io_service_impl* owner, operation* base,
90       const asio::error_code& /*ec*/,
91       std::size_t /*bytes_transferred*/)
92   {
93     // Take ownership of the handler object.
94     reactive_socket_recvfrom_op* o(
95         static_cast<reactive_socket_recvfrom_op*>(base));
96     ptr p = { asio::detail::addressof(o->handler_), o, o };
97 
98     ASIO_HANDLER_COMPLETION((o));
99 
100     // Make a copy of the handler so that the memory can be deallocated before
101     // the upcall is made. Even if we're not about to make an upcall, a
102     // sub-object of the handler may be the true owner of the memory associated
103     // with the handler. Consequently, a local copy of the handler is required
104     // to ensure that any owning sub-object remains valid until after we have
105     // deallocated the memory here.
106     detail::binder2<Handler, asio::error_code, std::size_t>
107       handler(o->handler_, o->ec_, o->bytes_transferred_);
108     p.h = asio::detail::addressof(handler.handler_);
109     p.reset();
110 
111     // Make the upcall if required.
112     if (owner)
113     {
114       fenced_block b(fenced_block::half);
115       ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
116       asio_handler_invoke_helpers::invoke(handler, handler.handler_);
117       ASIO_HANDLER_INVOCATION_END;
118     }
119   }
120 
121 private:
122   Handler handler_;
123 };
124 
125 } // namespace detail
126 } // namespace asio
127 
128 #include "asio/detail/pop_options.hpp"
129 
130 #endif // ASIO_DETAIL_REACTIVE_SOCKET_RECVFROM_OP_HPP
131