boost/asio/detail/win_iocp_null_buffers_op.hpp

   1 //
   2 // detail/win_iocp_null_buffers_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_NULL_BUFFERS_OP_HPP
  12 #define BOOST_ASIO_DETAIL_WIN_IOCP_NULL_BUFFERS_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/addressof.hpp>
  23 #include <boost/asio/detail/bind_handler.hpp>
  24 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
  25 #include <boost/asio/detail/fenced_block.hpp>
  26 #include <boost/asio/detail/handler_alloc_helpers.hpp>
  27 #include <boost/asio/detail/handler_invoke_helpers.hpp>
  28 #include <boost/asio/detail/reactor_op.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 Handler>
  39 class win_iocp_null_buffers_op : public reactor_op
  40 {
  41 public:
  42   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_null_buffers_op);
  43
  44   win_iocp_null_buffers_op(socket_ops::weak_cancel_token_type cancel_token,
  45       Handler& handler)
  46     : reactor_op(&win_iocp_null_buffers_op::do_perform,
  47         &win_iocp_null_buffers_op::do_complete),
  48       cancel_token_(cancel_token),
  49       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
  50   {
  51   }
  52
  53   static bool do_perform(reactor_op*)
  54   {
  55     return true;
  56   }
  57
  58   static void do_complete(io_service_impl* owner, operation* base,
  59       const boost::system::error_code& result_ec,
  60       std::size_t bytes_transferred)
  61   {
  62     boost::system::error_code ec(result_ec);
  63
  64     // Take ownership of the operation object.
  65     win_iocp_null_buffers_op* o(static_cast<win_iocp_null_buffers_op*>(base));
  66     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  67
  68     BOOST_ASIO_HANDLER_COMPLETION((o));
  69
  70     // The reactor may have stored a result in the operation object.
  71     if (o->ec_)
  72       ec = o->ec_;
  73
  74     // Map non-portable errors to their portable counterparts.
  75     if (ec.value() == ERROR_NETNAME_DELETED)
  76     {
  77       if (o->cancel_token_.expired())
  78         ec = boost::asio::error::operation_aborted;
  79       else
  80         ec = boost::asio::error::connection_reset;
  81     }
  82     else if (ec.value() == ERROR_PORT_UNREACHABLE)
  83     {
  84       ec = boost::asio::error::connection_refused;
  85     }
  86
  87     // Make a copy of the handler so that the memory can be deallocated before
  88     // the upcall is made. Even if we're not about to make an upcall, a
  89     // sub-object of the handler may be the true owner of the memory associated
  90     // with the handler. Consequently, a local copy of the handler is required
  91     // to ensure that any owning sub-object remains valid until after we have
  92     // deallocated the memory here.
  93     detail::binder2<Handler, boost::system::error_code, std::size_t>
  94       handler(o->handler_, ec, bytes_transferred);
  95     p.h = boost::asio::detail::addressof(handler.handler_);
  96     p.reset();
  97
  98     // Make the upcall if required.
  99     if (owner)
 100     {
 101       fenced_block b(fenced_block::half);
 102       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
 103       boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
 104       BOOST_ASIO_HANDLER_INVOCATION_END;
 105     }
 106   }
 107
 108 private:
 109   socket_ops::weak_cancel_token_type cancel_token_;
 110   Handler handler_;
 111 };
 112
 113 } // namespace detail
 114 } // namespace asio
 115 } // namespace boost
 116
 117 #include <boost/asio/detail/pop_options.hpp>
 118
 119 #endif // defined(BOOST_ASIO_HAS_IOCP)
 120
 121 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_NULL_BUFFERS_OP_HPP