ceph/src/boost/boost/asio/detail/reactive_socket_accept_op.hpp

   1 //
   2 // detail/reactive_socket_accept_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 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_ACCEPT_OP_HPP
  12 #define BOOST_ASIO_DETAIL_REACTIVE_SOCKET_ACCEPT_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/buffer_sequence_adapter.hpp>
  21 #include <boost/asio/detail/fenced_block.hpp>
  22 #include <boost/asio/detail/memory.hpp>
  23 #include <boost/asio/detail/reactor_op.hpp>
  24 #include <boost/asio/detail/socket_holder.hpp>
  25 #include <boost/asio/detail/socket_ops.hpp>
  26
  27 #include <boost/asio/detail/push_options.hpp>
  28
  29 namespace boost {
  30 namespace asio {
  31 namespace detail {
  32
  33 template <typename Socket, typename Protocol>
  34 class reactive_socket_accept_op_base : public reactor_op
  35 {
  36 public:
  37   reactive_socket_accept_op_base(socket_type socket,
  38       socket_ops::state_type state, Socket& peer, const Protocol& protocol,
  39       typename Protocol::endpoint* peer_endpoint, func_type complete_func)
  40     : reactor_op(&reactive_socket_accept_op_base::do_perform, complete_func),
  41       socket_(socket),
  42       state_(state),
  43       peer_(peer),
  44       protocol_(protocol),
  45       peer_endpoint_(peer_endpoint),
  46       addrlen_(peer_endpoint ? peer_endpoint->capacity() : 0)
  47   {
  48   }
  49
  50   static status do_perform(reactor_op* base)
  51   {
  52     reactive_socket_accept_op_base* o(
  53         static_cast<reactive_socket_accept_op_base*>(base));
  54
  55     socket_type new_socket = invalid_socket;
  56     status result = socket_ops::non_blocking_accept(o->socket_,
  57         o->state_, o->peer_endpoint_ ? o->peer_endpoint_->data() : 0,
  58         o->peer_endpoint_ ? &o->addrlen_ : 0, o->ec_, new_socket)
  59     ? done : not_done;
  60     o->new_socket_.reset(new_socket);
  61
  62     BOOST_ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_accept", o->ec_));
  63
  64     return result;
  65   }
  66
  67   void do_assign()
  68   {
  69     if (new_socket_.get() != invalid_socket)
  70     {
  71       if (peer_endpoint_)
  72         peer_endpoint_->resize(addrlen_);
  73       peer_.assign(protocol_, new_socket_.get(), ec_);
  74       if (!ec_)
  75         new_socket_.release();
  76     }
  77   }
  78
  79 private:
  80   socket_type socket_;
  81   socket_ops::state_type state_;
  82   socket_holder new_socket_;
  83   Socket& peer_;
  84   Protocol protocol_;
  85   typename Protocol::endpoint* peer_endpoint_;
  86   std::size_t addrlen_;
  87 };
  88
  89 template <typename Socket, typename Protocol, typename Handler>
  90 class reactive_socket_accept_op :
  91   public reactive_socket_accept_op_base<Socket, Protocol>
  92 {
  93 public:
  94   BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_socket_accept_op);
  95
  96   reactive_socket_accept_op(socket_type socket,
  97       socket_ops::state_type state, Socket& peer, const Protocol& protocol,
  98       typename Protocol::endpoint* peer_endpoint, Handler& handler)
  99     : reactive_socket_accept_op_base<Socket, Protocol>(socket, state, peer,
 100         protocol, peer_endpoint, &reactive_socket_accept_op::do_complete),
 101       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
 102   {
 103     handler_work<Handler>::start(handler_);
 104   }
 105
 106   static void do_complete(void* owner, operation* base,
 107       const boost::system::error_code& /*ec*/,
 108       std::size_t /*bytes_transferred*/)
 109   {
 110     // Take ownership of the handler object.
 111     reactive_socket_accept_op* o(static_cast<reactive_socket_accept_op*>(base));
 112     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
 113     handler_work<Handler> w(o->handler_);
 114
 115     // On success, assign new connection to peer socket object.
 116     if (owner)
 117       o->do_assign();
 118
 119     BOOST_ASIO_HANDLER_COMPLETION((*o));
 120
 121     // Make a copy of the handler so that the memory can be deallocated before
 122     // the upcall is made. Even if we're not about to make an upcall, a
 123     // sub-object of the handler may be the true owner of the memory associated
 124     // with the handler. Consequently, a local copy of the handler is required
 125     // to ensure that any owning sub-object remains valid until after we have
 126     // deallocated the memory here.
 127     detail::binder1<Handler, boost::system::error_code>
 128       handler(o->handler_, o->ec_);
 129     p.h = boost::asio::detail::addressof(handler.handler_);
 130     p.reset();
 131
 132     // Make the upcall if required.
 133     if (owner)
 134     {
 135       fenced_block b(fenced_block::half);
 136       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_));
 137       w.complete(handler, handler.handler_);
 138       BOOST_ASIO_HANDLER_INVOCATION_END;
 139     }
 140   }
 141
 142 private:
 143   Handler handler_;
 144 };
 145
 146 #if defined(BOOST_ASIO_HAS_MOVE)
 147
 148 template <typename Protocol, typename Handler>
 149 class reactive_socket_move_accept_op :
 150   private Protocol::socket,
 151   public reactive_socket_accept_op_base<typename Protocol::socket, Protocol>
 152 {
 153 public:
 154   BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_socket_move_accept_op);
 155
 156   reactive_socket_move_accept_op(io_context& ioc, socket_type socket,
 157       socket_ops::state_type state, const Protocol& protocol,
 158       typename Protocol::endpoint* peer_endpoint, Handler& handler)
 159     : Protocol::socket(ioc),
 160       reactive_socket_accept_op_base<typename Protocol::socket, Protocol>(
 161         socket, state, *this, protocol, peer_endpoint,
 162         &reactive_socket_move_accept_op::do_complete),
 163       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
 164   {
 165     handler_work<Handler>::start(handler_);
 166   }
 167
 168   static void do_complete(void* owner, operation* base,
 169       const boost::system::error_code& /*ec*/,
 170       std::size_t /*bytes_transferred*/)
 171   {
 172     // Take ownership of the handler object.
 173     reactive_socket_move_accept_op* o(
 174         static_cast<reactive_socket_move_accept_op*>(base));
 175     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
 176     handler_work<Handler> w(o->handler_);
 177
 178     // On success, assign new connection to peer socket object.
 179     if (owner)
 180       o->do_assign();
 181
 182     BOOST_ASIO_HANDLER_COMPLETION((*o));
 183
 184     // Make a copy of the handler so that the memory can be deallocated before
 185     // the upcall is made. Even if we're not about to make an upcall, a
 186     // sub-object of the handler may be the true owner of the memory associated
 187     // with the handler. Consequently, a local copy of the handler is required
 188     // to ensure that any owning sub-object remains valid until after we have
 189     // deallocated the memory here.
 190     detail::move_binder2<Handler,
 191       boost::system::error_code, typename Protocol::socket>
 192         handler(0, BOOST_ASIO_MOVE_CAST(Handler)(o->handler_), o->ec_,
 193           BOOST_ASIO_MOVE_CAST(typename Protocol::socket)(*o));
 194     p.h = boost::asio::detail::addressof(handler.handler_);
 195     p.reset();
 196
 197     // Make the upcall if required.
 198     if (owner)
 199     {
 200       fenced_block b(fenced_block::half);
 201       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, "..."));
 202       w.complete(handler, handler.handler_);
 203       BOOST_ASIO_HANDLER_INVOCATION_END;
 204     }
 205   }
 206
 207 private:
 208   Handler handler_;
 209 };
 210
 211 #endif // defined(BOOST_ASIO_HAS_MOVE)
 212
 213 } // namespace detail
 214 } // namespace asio
 215 } // namespace boost
 216
 217 #include <boost/asio/detail/pop_options.hpp>
 218
 219 #endif // BOOST_ASIO_DETAIL_REACTIVE_SOCKET_ACCEPT_OP_HPP