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

   1 //
   2 // detail/reactive_socket_sendto_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_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/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_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 status 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     status result = 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_) ? done : not_done;
  59
  60     BOOST_ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_sendto",
  61           o->ec_, o->bytes_transferred_));
  62
  63     return result;
  64   }
  65
  66 private:
  67   socket_type socket_;
  68   ConstBufferSequence buffers_;
  69   Endpoint destination_;
  70   socket_base::message_flags flags_;
  71 };
  72
  73 template <typename ConstBufferSequence, typename Endpoint, typename Handler>
  74 class reactive_socket_sendto_op :
  75   public reactive_socket_sendto_op_base<ConstBufferSequence, Endpoint>
  76 {
  77 public:
  78   BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_socket_sendto_op);
  79
  80   reactive_socket_sendto_op(socket_type socket,
  81       const ConstBufferSequence& buffers, const Endpoint& endpoint,
  82       socket_base::message_flags flags, Handler& handler)
  83     : reactive_socket_sendto_op_base<ConstBufferSequence, Endpoint>(socket,
  84         buffers, endpoint, flags, &reactive_socket_sendto_op::do_complete),
  85       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
  86   {
  87     handler_work<Handler>::start(handler_);
  88   }
  89
  90   static void do_complete(void* owner, operation* base,
  91       const boost::system::error_code& /*ec*/,
  92       std::size_t /*bytes_transferred*/)
  93   {
  94     // Take ownership of the handler object.
  95     reactive_socket_sendto_op* o(static_cast<reactive_socket_sendto_op*>(base));
  96     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  97     handler_work<Handler> w(o->handler_);
  98
  99     BOOST_ASIO_HANDLER_COMPLETION((*o));
 100
 101     // Make a copy of the handler so that the memory can be deallocated before
 102     // the upcall is made. Even if we're not about to make an upcall, a
 103     // sub-object of the handler may be the true owner of the memory associated
 104     // with the handler. Consequently, a local copy of the handler is required
 105     // to ensure that any owning sub-object remains valid until after we have
 106     // deallocated the memory here.
 107     detail::binder2<Handler, boost::system::error_code, std::size_t>
 108       handler(o->handler_, o->ec_, o->bytes_transferred_);
 109     p.h = boost::asio::detail::addressof(handler.handler_);
 110     p.reset();
 111
 112     // Make the upcall if required.
 113     if (owner)
 114     {
 115       fenced_block b(fenced_block::half);
 116       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
 117       w.complete(handler, handler.handler_);
 118       BOOST_ASIO_HANDLER_INVOCATION_END;
 119     }
 120   }
 121
 122 private:
 123   Handler handler_;
 124 };
 125
 126 } // namespace detail
 127 } // namespace asio
 128 } // namespace boost
 129
 130 #include <boost/asio/detail/pop_options.hpp>
 131
 132 #endif // BOOST_ASIO_DETAIL_REACTIVE_SOCKET_SENDTO_OP_HPP