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

   1 //
   2 // detail/win_iocp_handle_write_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 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_WRITE_OP_HPP
  13 #define BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_WRITE_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/bind_handler.hpp>
  25 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
  26 #include <boost/asio/detail/fenced_block.hpp>
  27 #include <boost/asio/detail/handler_alloc_helpers.hpp>
  28 #include <boost/asio/detail/handler_invoke_helpers.hpp>
  29 #include <boost/asio/detail/memory.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 ConstBufferSequence, typename Handler>
  39 class win_iocp_handle_write_op : public operation
  40 {
  41 public:
  42   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_handle_write_op);
  43
  44   win_iocp_handle_write_op(const ConstBufferSequence& buffers, Handler& handler)
  45     : operation(&win_iocp_handle_write_op::do_complete),
  46       buffers_(buffers),
  47       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
  48   {
  49     handler_work<Handler>::start(handler_);
  50   }
  51
  52   static void do_complete(void* owner, operation* base,
  53       const boost::system::error_code& ec, std::size_t bytes_transferred)
  54   {
  55     // Take ownership of the operation object.
  56     win_iocp_handle_write_op* o(static_cast<win_iocp_handle_write_op*>(base));
  57     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  58     handler_work<Handler> w(o->handler_);
  59
  60     BOOST_ASIO_HANDLER_COMPLETION((*o));
  61
  62 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  63     if (owner)
  64     {
  65       // Check whether buffers are still valid.
  66       buffer_sequence_adapter<boost::asio::const_buffer,
  67           ConstBufferSequence>::validate(o->buffers_);
  68     }
  69 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  70
  71     // Make a copy of the handler so that the memory can be deallocated before
  72     // the upcall is made. Even if we're not about to make an upcall, a
  73     // sub-object of the handler may be the true owner of the memory associated
  74     // with the handler. Consequently, a local copy of the handler is required
  75     // to ensure that any owning sub-object remains valid until after we have
  76     // deallocated the memory here.
  77     detail::binder2<Handler, boost::system::error_code, std::size_t>
  78       handler(o->handler_, ec, bytes_transferred);
  79     p.h = boost::asio::detail::addressof(handler.handler_);
  80     p.reset();
  81
  82     // Make the upcall if required.
  83     if (owner)
  84     {
  85       fenced_block b(fenced_block::half);
  86       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
  87       w.complete(handler, handler.handler_);
  88       BOOST_ASIO_HANDLER_INVOCATION_END;
  89     }
  90   }
  91
  92 private:
  93   ConstBufferSequence buffers_;
  94   Handler handler_;
  95 };
  96
  97 } // namespace detail
  98 } // namespace asio
  99 } // namespace boost
 100
 101 #include <boost/asio/detail/pop_options.hpp>
 102
 103 #endif // defined(BOOST_ASIO_HAS_IOCP)
 104
 105 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_WRITE_OP_HPP