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

   1 //
   2 // detail/win_iocp_socket_recvfrom_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_WIN_IOCP_SOCKET_RECVFROM_OP_HPP
  12 #define BOOST_ASIO_DETAIL_WIN_IOCP_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
  20 #if defined(BOOST_ASIO_HAS_IOCP)
  21
  22 #include <boost/asio/detail/bind_handler.hpp>
  23 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
  24 #include <boost/asio/detail/fenced_block.hpp>
  25 #include <boost/asio/detail/handler_alloc_helpers.hpp>
  26 #include <boost/asio/detail/handler_invoke_helpers.hpp>
  27 #include <boost/asio/detail/memory.hpp>
  28 #include <boost/asio/detail/operation.hpp>
  29 #include <boost/asio/detail/socket_ops.hpp>
  30 #include <boost/asio/error.hpp>
  31
  32 #include <boost/asio/detail/push_options.hpp>
  33
  34 namespace boost {
  35 namespace asio {
  36 namespace detail {
  37
  38 template <typename MutableBufferSequence, typename Endpoint, typename Handler>
  39 class win_iocp_socket_recvfrom_op : public operation
  40 {
  41 public:
  42   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_recvfrom_op);
  43
  44   win_iocp_socket_recvfrom_op(Endpoint& endpoint,
  45       socket_ops::weak_cancel_token_type cancel_token,
  46       const MutableBufferSequence& buffers, Handler& handler)
  47     : operation(&win_iocp_socket_recvfrom_op::do_complete),
  48       endpoint_(endpoint),
  49       endpoint_size_(static_cast<int>(endpoint.capacity())),
  50       cancel_token_(cancel_token),
  51       buffers_(buffers),
  52       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
  53   {
  54     handler_work<Handler>::start(handler_);
  55   }
  56
  57   int& endpoint_size()
  58   {
  59     return endpoint_size_;
  60   }
  61
  62   static void do_complete(void* owner, operation* base,
  63       const boost::system::error_code& result_ec,
  64       std::size_t bytes_transferred)
  65   {
  66     boost::system::error_code ec(result_ec);
  67
  68     // Take ownership of the operation object.
  69     win_iocp_socket_recvfrom_op* o(
  70         static_cast<win_iocp_socket_recvfrom_op*>(base));
  71     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  72     handler_work<Handler> w(o->handler_);
  73
  74     BOOST_ASIO_HANDLER_COMPLETION((*o));
  75
  76 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  77     // Check whether buffers are still valid.
  78     if (owner)
  79     {
  80       buffer_sequence_adapter<boost::asio::mutable_buffer,
  81           MutableBufferSequence>::validate(o->buffers_);
  82     }
  83 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  84
  85     socket_ops::complete_iocp_recvfrom(o->cancel_token_, ec);
  86
  87     // Record the size of the endpoint returned by the operation.
  88     o->endpoint_.resize(o->endpoint_size_);
  89
  90     // Make a copy of the handler so that the memory can be deallocated before
  91     // the upcall is made. Even if we're not about to make an upcall, a
  92     // sub-object of the handler may be the true owner of the memory associated
  93     // with the handler. Consequently, a local copy of the handler is required
  94     // to ensure that any owning sub-object remains valid until after we have
  95     // deallocated the memory here.
  96     detail::binder2<Handler, boost::system::error_code, std::size_t>
  97       handler(o->handler_, ec, bytes_transferred);
  98     p.h = boost::asio::detail::addressof(handler.handler_);
  99     p.reset();
 100
 101     // Make the upcall if required.
 102     if (owner)
 103     {
 104       fenced_block b(fenced_block::half);
 105       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
 106       w.complete(handler, handler.handler_);
 107       BOOST_ASIO_HANDLER_INVOCATION_END;
 108     }
 109   }
 110
 111 private:
 112   Endpoint& endpoint_;
 113   int endpoint_size_;
 114   socket_ops::weak_cancel_token_type cancel_token_;
 115   MutableBufferSequence buffers_;
 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 // defined(BOOST_ASIO_HAS_IOCP)
 126
 127 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVFROM_OP_HPP