1 //
2 // detail/reactive_socket_connect_op.hpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2021 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_CONNECT_OP_HPP
12 #define BOOST_ASIO_DETAIL_REACTIVE_SOCKET_CONNECT_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/bind_handler.hpp>
20 #include <boost/asio/detail/fenced_block.hpp>
21 #include <boost/asio/detail/handler_alloc_helpers.hpp>
22 #include <boost/asio/detail/handler_invoke_helpers.hpp>
23 #include <boost/asio/detail/handler_work.hpp>
24 #include <boost/asio/detail/memory.hpp>
25 #include <boost/asio/detail/reactor_op.hpp>
26 #include <boost/asio/detail/socket_ops.hpp>
27 
28 #include <boost/asio/detail/push_options.hpp>
29 
30 namespace boost {
31 namespace asio {
32 namespace detail {
33 
34 class reactive_socket_connect_op_base : public reactor_op
35 {
36 public:
reactive_socket_connect_op_base(const boost::system::error_code & success_ec,socket_type socket,func_type complete_func)37   reactive_socket_connect_op_base(const boost::system::error_code& success_ec,
38       socket_type socket, func_type complete_func)
39     : reactor_op(success_ec,
40         &reactive_socket_connect_op_base::do_perform, complete_func),
41       socket_(socket)
42   {
43   }
44 
do_perform(reactor_op * base)45   static status do_perform(reactor_op* base)
46   {
47     reactive_socket_connect_op_base* o(
48         static_cast<reactive_socket_connect_op_base*>(base));
49 
50     status result = socket_ops::non_blocking_connect(
51         o->socket_, o->ec_) ? done : not_done;
52 
53     BOOST_ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_connect", o->ec_));
54 
55     return result;
56   }
57 
58 private:
59   socket_type socket_;
60 };
61 
62 template <typename Handler, typename IoExecutor>
63 class reactive_socket_connect_op : public reactive_socket_connect_op_base
64 {
65 public:
66   BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_socket_connect_op);
67 
reactive_socket_connect_op(const boost::system::error_code & success_ec,socket_type socket,Handler & handler,const IoExecutor & io_ex)68   reactive_socket_connect_op(const boost::system::error_code& success_ec,
69       socket_type socket, Handler& handler, const IoExecutor& io_ex)
70     : reactive_socket_connect_op_base(success_ec, socket,
71         &reactive_socket_connect_op::do_complete),
72       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
73       work_(handler_, io_ex)
74   {
75   }
76 
do_complete(void * owner,operation * base,const boost::system::error_code &,std::size_t)77   static void do_complete(void* owner, operation* base,
78       const boost::system::error_code& /*ec*/,
79       std::size_t /*bytes_transferred*/)
80   {
81     // Take ownership of the handler object.
82     reactive_socket_connect_op* o
83       (static_cast<reactive_socket_connect_op*>(base));
84     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
85 
86     BOOST_ASIO_HANDLER_COMPLETION((*o));
87 
88     // Take ownership of the operation's outstanding work.
89     handler_work<Handler, IoExecutor> w(
90         BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
91           o->work_));
92 
93     // Make a copy of the handler so that the memory can be deallocated before
94     // the upcall is made. Even if we're not about to make an upcall, a
95     // sub-object of the handler may be the true owner of the memory associated
96     // with the handler. Consequently, a local copy of the handler is required
97     // to ensure that any owning sub-object remains valid until after we have
98     // deallocated the memory here.
99     detail::binder1<Handler, boost::system::error_code>
100       handler(o->handler_, o->ec_);
101     p.h = boost::asio::detail::addressof(handler.handler_);
102     p.reset();
103 
104     // Make the upcall if required.
105     if (owner)
106     {
107       fenced_block b(fenced_block::half);
108       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_));
109       w.complete(handler, handler.handler_);
110       BOOST_ASIO_HANDLER_INVOCATION_END;
111     }
112   }
113 
114 private:
115   Handler handler_;
116   handler_work<Handler, IoExecutor> work_;
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_CONNECT_OP_HPP
126