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) 2003-2022 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/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/handler_work.hpp>
  29 #include <boost/asio/detail/memory.hpp>
  30 #include <boost/asio/detail/operation.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_handle_write_op : public operation
  41 {
  42 public:
  43   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_handle_write_op);
  44
  45   win_iocp_handle_write_op(const ConstBufferSequence& buffers,
  46       Handler& handler, const IoExecutor& io_ex)
  47     : operation(&win_iocp_handle_write_op::do_complete),
  48       buffers_(buffers),
  49       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
  50       work_(handler_, io_ex)
  51   {
  52   }
  53
  54   static void do_complete(void* owner, operation* base,
  55       const boost::system::error_code& ec, std::size_t bytes_transferred)
  56   {
  57     // Take ownership of the operation object.
  58     win_iocp_handle_write_op* o(static_cast<win_iocp_handle_write_op*>(base));
  59     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  60
  61     BOOST_ASIO_HANDLER_COMPLETION((*o));
  62
  63     // Take ownership of the operation's outstanding work.
  64     handler_work<Handler, IoExecutor> w(
  65         BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
  66           o->work_));
  67
  68 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  69     if (owner)
  70     {
  71       // Check whether buffers are still valid.
  72       buffer_sequence_adapter<boost::asio::const_buffer,
  73           ConstBufferSequence>::validate(o->buffers_);
  74     }
  75 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  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       w.complete(handler, handler.handler_);
  94       BOOST_ASIO_HANDLER_INVOCATION_END;
  95     }
  96   }
  97
  98 private:
  99   ConstBufferSequence buffers_;
 100   Handler handler_;
 101   handler_work<Handler, IoExecutor> work_;
 102 };
 103
 104 } // namespace detail
 105 } // namespace asio
 106 } // namespace boost
 107
 108 #include <boost/asio/detail/pop_options.hpp>
 109
 110 #endif // defined(BOOST_ASIO_HAS_IOCP)
 111
 112 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_WRITE_OP_HPP