ceph/src/boost/libs/asio/include/boost/asio/detail/reactive_socket_sendto_op.hpp

   1 //
   2 // detail/reactive_socket_sendto_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2016 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_SENDTO_OP_HPP
  12 #define BOOST_ASIO_DETAIL_REACTIVE_SOCKET_SENDTO_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 ConstBufferSequence, typename Endpoint>
  33 class reactive_socket_sendto_op_base : public reactor_op
  34 {
  35 public:
  36   reactive_socket_sendto_op_base(socket_type socket,
  37       const ConstBufferSequence& buffers, const Endpoint& endpoint,
  38       socket_base::message_flags flags, func_type complete_func)
  39     : reactor_op(&reactive_socket_sendto_op_base::do_perform, complete_func),
  40       socket_(socket),
  41       buffers_(buffers),
  42       destination_(endpoint),
  43       flags_(flags)
  44   {
  45   }
  46
  47   static bool do_perform(reactor_op* base)
  48   {
  49     reactive_socket_sendto_op_base* o(
  50         static_cast<reactive_socket_sendto_op_base*>(base));
  51
  52     buffer_sequence_adapter<boost::asio::const_buffer,
  53         ConstBufferSequence> bufs(o->buffers_);
  54
  55     return socket_ops::non_blocking_sendto(o->socket_,
  56           bufs.buffers(), bufs.count(), o->flags_,
  57           o->destination_.data(), o->destination_.size(),
  58           o->ec_, o->bytes_transferred_);
  59   }
  60
  61 private:
  62   socket_type socket_;
  63   ConstBufferSequence buffers_;
  64   Endpoint destination_;
  65   socket_base::message_flags flags_;
  66 };
  67
  68 template <typename ConstBufferSequence, typename Endpoint, typename Handler>
  69 class reactive_socket_sendto_op :
  70   public reactive_socket_sendto_op_base<ConstBufferSequence, Endpoint>
  71 {
  72 public:
  73   BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_socket_sendto_op);
  74
  75   reactive_socket_sendto_op(socket_type socket,
  76       const ConstBufferSequence& buffers, const Endpoint& endpoint,
  77       socket_base::message_flags flags, Handler& handler)
  78     : reactive_socket_sendto_op_base<ConstBufferSequence, Endpoint>(socket,
  79         buffers, endpoint, flags, &reactive_socket_sendto_op::do_complete),
  80       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
  81   {
  82   }
  83
  84   static void do_complete(io_service_impl* owner, operation* base,
  85       const boost::system::error_code& /*ec*/,
  86       std::size_t /*bytes_transferred*/)
  87   {
  88     // Take ownership of the handler object.
  89     reactive_socket_sendto_op* o(static_cast<reactive_socket_sendto_op*>(base));
  90     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  91
  92     BOOST_ASIO_HANDLER_COMPLETION((o));
  93
  94     // Make a copy of the handler so that the memory can be deallocated before
  95     // the upcall is made. Even if we're not about to make an upcall, a
  96     // sub-object of the handler may be the true owner of the memory associated
  97     // with the handler. Consequently, a local copy of the handler is required
  98     // to ensure that any owning sub-object remains valid until after we have
  99     // deallocated the memory here.
 100     detail::binder2<Handler, boost::system::error_code, std::size_t>
 101       handler(o->handler_, o->ec_, o->bytes_transferred_);
 102     p.h = boost::asio::detail::addressof(handler.handler_);
 103     p.reset();
 104
 105     // Make the upcall if required.
 106     if (owner)
 107     {
 108       fenced_block b(fenced_block::half);
 109       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
 110       boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
 111       BOOST_ASIO_HANDLER_INVOCATION_END;
 112     }
 113   }
 114
 115 private:
 116   Handler handler_;
 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_SENDTO_OP_HPP