boost/asio/detail/win_iocp_socket_recvmsg_op.hpp

   1 //
   2 // detail/win_iocp_socket_recvmsg_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_RECVMSG_OP_HPP
  12 #define BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVMSG_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/operation.hpp>
  29 #include <boost/asio/detail/socket_ops.hpp>
  30 #include <boost/asio/error.hpp>
  31 #include <boost/asio/socket_base.hpp>
  32
  33 #include <boost/asio/detail/push_options.hpp>
  34
  35 namespace boost {
  36 namespace asio {
  37 namespace detail {
  38
  39 template <typename MutableBufferSequence, typename Handler>
  40 class win_iocp_socket_recvmsg_op : public operation
  41 {
  42 public:
  43   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_recvmsg_op);
  44
  45   win_iocp_socket_recvmsg_op(
  46       socket_ops::weak_cancel_token_type cancel_token,
  47       const MutableBufferSequence& buffers,
  48       socket_base::message_flags& out_flags, Handler& handler)
  49     : operation(&win_iocp_socket_recvmsg_op::do_complete),
  50       cancel_token_(cancel_token),
  51       buffers_(buffers),
  52       out_flags_(out_flags),
  53       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
  54   {
  55   }
  56
  57   static void do_complete(io_service_impl* owner, operation* base,
  58       const boost::system::error_code& result_ec,
  59       std::size_t bytes_transferred)
  60   {
  61     boost::system::error_code ec(result_ec);
  62
  63     // Take ownership of the operation object.
  64     win_iocp_socket_recvmsg_op* o(
  65         static_cast<win_iocp_socket_recvmsg_op*>(base));
  66     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  67
  68     BOOST_ASIO_HANDLER_COMPLETION((o));
  69
  70 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  71     // Check whether buffers are still valid.
  72     if (owner)
  73     {
  74       buffer_sequence_adapter<boost::asio::mutable_buffer,
  75           MutableBufferSequence>::validate(o->buffers_);
  76     }
  77 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  78
  79     socket_ops::complete_iocp_recvmsg(o->cancel_token_, ec);
  80     o->out_flags_ = 0;
  81
  82     // Make a copy of the handler so that the memory can be deallocated before
  83     // the upcall is made. Even if we're not about to make an upcall, a
  84     // sub-object of the handler may be the true owner of the memory associated
  85     // with the handler. Consequently, a local copy of the handler is required
  86     // to ensure that any owning sub-object remains valid until after we have
  87     // deallocated the memory here.
  88     detail::binder2<Handler, boost::system::error_code, std::size_t>
  89       handler(o->handler_, ec, bytes_transferred);
  90     p.h = boost::asio::detail::addressof(handler.handler_);
  91     p.reset();
  92
  93     // Make the upcall if required.
  94     if (owner)
  95     {
  96       fenced_block b(fenced_block::half);
  97       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
  98       boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
  99       BOOST_ASIO_HANDLER_INVOCATION_END;
 100     }
 101   }
 102
 103 private:
 104   socket_ops::weak_cancel_token_type cancel_token_;
 105   MutableBufferSequence buffers_;
 106   socket_base::message_flags& out_flags_;
 107   Handler handler_;
 108 };
 109
 110 } // namespace detail
 111 } // namespace asio
 112 } // namespace boost
 113
 114 #include <boost/asio/detail/pop_options.hpp>
 115
 116 #endif // defined(BOOST_ASIO_HAS_IOCP)
 117
 118 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVMSG_OP_HPP