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

   1 //
   2 // detail/win_iocp_socket_send_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 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_SEND_OP_HPP
  12 #define BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_SEND_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/handler_work.hpp>
  28 #include <boost/asio/detail/memory.hpp>
  29 #include <boost/asio/detail/operation.hpp>
  30 #include <boost/asio/detail/socket_ops.hpp>
  31 #include <boost/asio/error.hpp>
  32
  33 #include <boost/asio/detail/push_options.hpp>
  34
  35 namespace boost {
  36 namespace asio {
  37 namespace detail {
  38
  39 template <typename ConstBufferSequence, typename Handler, typename IoExecutor>
  40 class win_iocp_socket_send_op : public operation
  41 {
  42 public:
  43   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_send_op);
  44
  45   win_iocp_socket_send_op(socket_ops::weak_cancel_token_type cancel_token,
  46       const ConstBufferSequence& buffers, Handler& handler,
  47       const IoExecutor& io_ex)
  48     : operation(&win_iocp_socket_send_op::do_complete),
  49       cancel_token_(cancel_token),
  50       buffers_(buffers),
  51       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
  52       work_(handler_, io_ex)
  53   {
  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_send_op* o(static_cast<win_iocp_socket_send_op*>(base));
  64     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  65
  66     BOOST_ASIO_HANDLER_COMPLETION((*o));
  67
  68     // Take ownership of the operation's outstanding work.
  69     handler_work<Handler, IoExecutor> w(
  70         BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
  71           o->work_));
  72
  73 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  74     // Check whether buffers are still valid.
  75     if (owner)
  76     {
  77       buffer_sequence_adapter<boost::asio::const_buffer,
  78           ConstBufferSequence>::validate(o->buffers_);
  79     }
  80 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  81
  82     socket_ops::complete_iocp_send(o->cancel_token_, ec);
  83
  84     // Make a copy of the handler so that the memory can be deallocated before
  85     // the upcall is made. Even if we're not about to make an upcall, a
  86     // sub-object of the handler may be the true owner of the memory associated
  87     // with the handler. Consequently, a local copy of the handler is required
  88     // to ensure that any owning sub-object remains valid until after we have
  89     // deallocated the memory here.
  90     detail::binder2<Handler, boost::system::error_code, std::size_t>
  91       handler(o->handler_, ec, bytes_transferred);
  92     p.h = boost::asio::detail::addressof(handler.handler_);
  93     p.reset();
  94
  95     // Make the upcall if required.
  96     if (owner)
  97     {
  98       fenced_block b(fenced_block::half);
  99       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
 100       w.complete(handler, handler.handler_);
 101       BOOST_ASIO_HANDLER_INVOCATION_END;
 102     }
 103   }
 104
 105 private:
 106   socket_ops::weak_cancel_token_type cancel_token_;
 107   ConstBufferSequence buffers_;
 108   Handler handler_;
 109   handler_work<Handler, IoExecutor> work_;
 110 };
 111
 112 } // namespace detail
 113 } // namespace asio
 114 } // namespace boost
 115
 116 #include <boost/asio/detail/pop_options.hpp>
 117
 118 #endif // defined(BOOST_ASIO_HAS_IOCP)
 119
 120 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_SEND_OP_HPP