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

   1 //
   2 // detail/win_iocp_overlapped_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_OVERLAPPED_OP_HPP
  12 #define BOOST_ASIO_DETAIL_WIN_IOCP_OVERLAPPED_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/error.hpp>
  23 #include <boost/asio/detail/bind_handler.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/memory.hpp>
  28 #include <boost/asio/detail/operation.hpp>
  29
  30 #include <boost/asio/detail/push_options.hpp>
  31
  32 namespace boost {
  33 namespace asio {
  34 namespace detail {
  35
  36 template <typename Handler, typename IoExecutor>
  37 class win_iocp_overlapped_op : public operation
  38 {
  39 public:
  40   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_overlapped_op);
  41
  42   win_iocp_overlapped_op(Handler& handler, const IoExecutor& io_ex)
  43     : operation(&win_iocp_overlapped_op::do_complete),
  44       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
  45       io_executor_(io_ex)
  46   {
  47     handler_work<Handler, IoExecutor>::start(handler_, io_executor_);
  48   }
  49
  50   static void do_complete(void* owner, operation* base,
  51       const boost::system::error_code& ec, std::size_t bytes_transferred)
  52   {
  53     // Take ownership of the operation object.
  54     win_iocp_overlapped_op* o(static_cast<win_iocp_overlapped_op*>(base));
  55     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  56     handler_work<Handler, IoExecutor> w(o->handler_, o->io_executor_);
  57
  58     BOOST_ASIO_HANDLER_COMPLETION((*o));
  59
  60     // Make a copy of the handler so that the memory can be deallocated before
  61     // the upcall is made. Even if we're not about to make an upcall, a
  62     // sub-object of the handler may be the true owner of the memory associated
  63     // with the handler. Consequently, a local copy of the handler is required
  64     // to ensure that any owning sub-object remains valid until after we have
  65     // deallocated the memory here.
  66     detail::binder2<Handler, boost::system::error_code, std::size_t>
  67       handler(o->handler_, ec, bytes_transferred);
  68     p.h = boost::asio::detail::addressof(handler.handler_);
  69     p.reset();
  70
  71     // Make the upcall if required.
  72     if (owner)
  73     {
  74       fenced_block b(fenced_block::half);
  75       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
  76       w.complete(handler, handler.handler_);
  77       BOOST_ASIO_HANDLER_INVOCATION_END;
  78     }
  79   }
  80
  81 private:
  82   Handler handler_;
  83   IoExecutor io_executor_;
  84 };
  85
  86 } // namespace detail
  87 } // namespace asio
  88 } // namespace boost
  89
  90 #include <boost/asio/detail/pop_options.hpp>
  91
  92 #endif // defined(BOOST_ASIO_HAS_IOCP)
  93
  94 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_OVERLAPPED_OP_HPP