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

   1 //
   2 // detail/win_iocp_socket_recv_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_RECV_OP_HPP
  12 #define BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECV_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 Handler>
  39 class win_iocp_socket_recv_op : public operation
  40 {
  41 public:
  42   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_recv_op);
  43
  44   win_iocp_socket_recv_op(socket_ops::state_type state,
  45       socket_ops::weak_cancel_token_type cancel_token,
  46       const MutableBufferSequence& buffers, Handler& handler)
  47     : operation(&win_iocp_socket_recv_op::do_complete),
  48       state_(state),
  49       cancel_token_(cancel_token),
  50       buffers_(buffers),
  51       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
  52   {
  53     handler_work<Handler>::start(handler_);
  54   }
  55
  56   static void do_complete(void* owner, operation* base,
  57       const boost::system::error_code& result_ec,
  58       std::size_t bytes_transferred)
  59   {
  60     boost::system::error_code ec(result_ec);
  61
  62     // Take ownership of the operation object.
  63     win_iocp_socket_recv_op* o(static_cast<win_iocp_socket_recv_op*>(base));
  64     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  65     handler_work<Handler> w(o->handler_);
  66
  67     BOOST_ASIO_HANDLER_COMPLETION((*o));
  68
  69 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  70     // Check whether buffers are still valid.
  71     if (owner)
  72     {
  73       buffer_sequence_adapter<boost::asio::mutable_buffer,
  74           MutableBufferSequence>::validate(o->buffers_);
  75     }
  76 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  77
  78     socket_ops::complete_iocp_recv(o->state_, o->cancel_token_,
  79         buffer_sequence_adapter<boost::asio::mutable_buffer,
  80           MutableBufferSequence>::all_empty(o->buffers_),
  81         ec, bytes_transferred);
  82
  83     // Make a copy of the handler so that the memory can be deallocated before
  84     // the upcall is made. Even if we're not about to make an upcall, a
  85     // sub-object of the handler may be the true owner of the memory associated
  86     // with the handler. Consequently, a local copy of the handler is required
  87     // to ensure that any owning sub-object remains valid until after we have
  88     // deallocated the memory here.
  89     detail::binder2<Handler, boost::system::error_code, std::size_t>
  90       handler(o->handler_, ec, bytes_transferred);
  91     p.h = boost::asio::detail::addressof(handler.handler_);
  92     p.reset();
  93
  94     // Make the upcall if required.
  95     if (owner)
  96     {
  97       fenced_block b(fenced_block::half);
  98       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
  99       w.complete(handler, handler.handler_);
 100       BOOST_ASIO_HANDLER_INVOCATION_END;
 101     }
 102   }
 103
 104 private:
 105   socket_ops::state_type state_;
 106   socket_ops::weak_cancel_token_type cancel_token_;
 107   MutableBufferSequence buffers_;
 108   Handler handler_;
 109 };
 110
 111 } // namespace detail
 112 } // namespace asio
 113 } // namespace boost
 114
 115 #include <boost/asio/detail/pop_options.hpp>
 116
 117 #endif // defined(BOOST_ASIO_HAS_IOCP)
 118
 119 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECV_OP_HPP