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

   1 //
   2 // detail/reactive_socket_recvfrom_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2019 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_RECVFROM_OP_HPP
  12 #define BOOST_ASIO_DETAIL_REACTIVE_SOCKET_RECVFROM_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 MutableBufferSequence, typename Endpoint>
  33 class reactive_socket_recvfrom_op_base : public reactor_op
  34 {
  35 public:
  36   reactive_socket_recvfrom_op_base(socket_type socket, int protocol_type,
  37       const MutableBufferSequence& buffers, Endpoint& endpoint,
  38       socket_base::message_flags flags, func_type complete_func)
  39     : reactor_op(&reactive_socket_recvfrom_op_base::do_perform, complete_func),
  40       socket_(socket),
  41       protocol_type_(protocol_type),
  42       buffers_(buffers),
  43       sender_endpoint_(endpoint),
  44       flags_(flags)
  45   {
  46   }
  47
  48   static status do_perform(reactor_op* base)
  49   {
  50     reactive_socket_recvfrom_op_base* o(
  51         static_cast<reactive_socket_recvfrom_op_base*>(base));
  52
  53     buffer_sequence_adapter<boost::asio::mutable_buffer,
  54         MutableBufferSequence> bufs(o->buffers_);
  55
  56     std::size_t addr_len = o->sender_endpoint_.capacity();
  57     status result = socket_ops::non_blocking_recvfrom(o->socket_,
  58         bufs.buffers(), bufs.count(), o->flags_,
  59         o->sender_endpoint_.data(), &addr_len,
  60         o->ec_, o->bytes_transferred_) ? done : not_done;
  61
  62     if (result && !o->ec_)
  63       o->sender_endpoint_.resize(addr_len);
  64
  65     BOOST_ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_recvfrom",
  66           o->ec_, o->bytes_transferred_));
  67
  68     return result;
  69   }
  70
  71 private:
  72   socket_type socket_;
  73   int protocol_type_;
  74   MutableBufferSequence buffers_;
  75   Endpoint& sender_endpoint_;
  76   socket_base::message_flags flags_;
  77 };
  78
  79 template <typename MutableBufferSequence, typename Endpoint,
  80     typename Handler, typename IoExecutor>
  81 class reactive_socket_recvfrom_op :
  82   public reactive_socket_recvfrom_op_base<MutableBufferSequence, Endpoint>
  83 {
  84 public:
  85   BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_socket_recvfrom_op);
  86
  87   reactive_socket_recvfrom_op(socket_type socket, int protocol_type,
  88       const MutableBufferSequence& buffers, Endpoint& endpoint,
  89       socket_base::message_flags flags, Handler& handler,
  90       const IoExecutor& io_ex)
  91     : reactive_socket_recvfrom_op_base<MutableBufferSequence, Endpoint>(
  92         socket, protocol_type, buffers, endpoint, flags,
  93         &reactive_socket_recvfrom_op::do_complete),
  94       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
  95       io_executor_(io_ex)
  96   {
  97     handler_work<Handler, IoExecutor>::start(handler_, io_executor_);
  98   }
  99
 100   static void do_complete(void* owner, operation* base,
 101       const boost::system::error_code& /*ec*/,
 102       std::size_t /*bytes_transferred*/)
 103   {
 104     // Take ownership of the handler object.
 105     reactive_socket_recvfrom_op* o(
 106         static_cast<reactive_socket_recvfrom_op*>(base));
 107     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
 108     handler_work<Handler, IoExecutor> w(o->handler_, o->io_executor_);
 109
 110     BOOST_ASIO_HANDLER_COMPLETION((*o));
 111
 112     // Make a copy of the handler so that the memory can be deallocated before
 113     // the upcall is made. Even if we're not about to make an upcall, a
 114     // sub-object of the handler may be the true owner of the memory associated
 115     // with the handler. Consequently, a local copy of the handler is required
 116     // to ensure that any owning sub-object remains valid until after we have
 117     // deallocated the memory here.
 118     detail::binder2<Handler, boost::system::error_code, std::size_t>
 119       handler(o->handler_, o->ec_, o->bytes_transferred_);
 120     p.h = boost::asio::detail::addressof(handler.handler_);
 121     p.reset();
 122
 123     // Make the upcall if required.
 124     if (owner)
 125     {
 126       fenced_block b(fenced_block::half);
 127       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
 128       w.complete(handler, handler.handler_);
 129       BOOST_ASIO_HANDLER_INVOCATION_END;
 130     }
 131   }
 132
 133 private:
 134   Handler handler_;
 135   IoExecutor io_executor_;
 136 };
 137
 138 } // namespace detail
 139 } // namespace asio
 140 } // namespace boost
 141
 142 #include <boost/asio/detail/pop_options.hpp>
 143
 144 #endif // BOOST_ASIO_DETAIL_REACTIVE_SOCKET_RECVFROM_OP_HPP