boost/asio/detail/win_iocp_handle_read_op.hpp

   1 //
   2 // detail/win_iocp_handle_read_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2014 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 // Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.com)
   7 //
   8 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   9 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  10 //
  11
  12 #ifndef BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_READ_OP_HPP
  13 #define BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_READ_OP_HPP
  14
  15 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  16 # pragma once
  17 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  18
  19 #include <boost/asio/detail/config.hpp>
  20
  21 #if defined(BOOST_ASIO_HAS_IOCP)
  22
  23 #include <boost/asio/error.hpp>
  24 #include <boost/asio/detail/addressof.hpp>
  25 #include <boost/asio/detail/bind_handler.hpp>
  26 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
  27 #include <boost/asio/detail/fenced_block.hpp>
  28 #include <boost/asio/detail/handler_alloc_helpers.hpp>
  29 #include <boost/asio/detail/handler_invoke_helpers.hpp>
  30 #include <boost/asio/detail/operation.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_handle_read_op : public operation
  40 {
  41 public:
  42   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_handle_read_op);
  43
  44   win_iocp_handle_read_op(
  45       const MutableBufferSequence& buffers, Handler& handler)
  46     : operation(&win_iocp_handle_read_op::do_complete),
  47       buffers_(buffers),
  48       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
  49   {
  50   }
  51
  52   static void do_complete(io_service_impl* owner, operation* base,
  53       const boost::system::error_code& result_ec,
  54       std::size_t bytes_transferred)
  55   {
  56     boost::system::error_code ec(result_ec);
  57
  58     // Take ownership of the operation object.
  59     win_iocp_handle_read_op* o(static_cast<win_iocp_handle_read_op*>(base));
  60     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  61
  62     BOOST_ASIO_HANDLER_COMPLETION((o));
  63
  64 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  65     if (owner)
  66     {
  67       // Check whether buffers are still valid.
  68       buffer_sequence_adapter<boost::asio::mutable_buffer,
  69           MutableBufferSequence>::validate(o->buffers_);
  70     }
  71 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  72
  73     // Map non-portable errors to their portable counterparts.
  74     if (ec.value() == ERROR_HANDLE_EOF)
  75       ec = boost::asio::error::eof;
  76
  77     // Make a copy of the handler so that the memory can be deallocated before
  78     // the upcall is made. Even if we're not about to make an upcall, a
  79     // sub-object of the handler may be the true owner of the memory associated
  80     // with the handler. Consequently, a local copy of the handler is required
  81     // to ensure that any owning sub-object remains valid until after we have
  82     // deallocated the memory here.
  83     detail::binder2<Handler, boost::system::error_code, std::size_t>
  84       handler(o->handler_, ec, bytes_transferred);
  85     p.h = boost::asio::detail::addressof(handler.handler_);
  86     p.reset();
  87
  88     // Make the upcall if required.
  89     if (owner)
  90     {
  91       fenced_block b(fenced_block::half);
  92       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
  93       boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
  94       BOOST_ASIO_HANDLER_INVOCATION_END;
  95     }
  96   }
  97
  98 private:
  99   MutableBufferSequence buffers_;
 100   Handler handler_;
 101 };
 102
 103 } // namespace detail
 104 } // namespace asio
 105 } // namespace boost
 106
 107 #include <boost/asio/detail/pop_options.hpp>
 108
 109 #endif // defined(BOOST_ASIO_HAS_IOCP)
 110
 111 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_READ_OP_HPP