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

   1 //
   2 // detail/win_iocp_handle_read_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2019 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_READ_OP_HPP
  13 #define BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_READ_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 MutableBufferSequence, typename Handler, typename IoExecutor>
  39 class win_iocp_handle_read_op : public operation
  40 {
  41 public:
  42   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_handle_read_op);
  43
  44   win_iocp_handle_read_op(const MutableBufferSequence& buffers,
  45       Handler& handler, const IoExecutor& io_ex)
  46     : operation(&win_iocp_handle_read_op::do_complete),
  47       buffers_(buffers),
  48       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
  49       io_executor_(io_ex)
  50   {
  51     handler_work<Handler, IoExecutor>::start(handler_, io_executor_);
  52   }
  53
  54   static void do_complete(void* owner, operation* base,
  55       const boost::system::error_code& result_ec,
  56       std::size_t bytes_transferred)
  57   {
  58     boost::system::error_code ec(result_ec);
  59
  60     // Take ownership of the operation object.
  61     win_iocp_handle_read_op* o(static_cast<win_iocp_handle_read_op*>(base));
  62     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  63     handler_work<Handler, IoExecutor> w(o->handler_, o->io_executor_);
  64
  65     BOOST_ASIO_HANDLER_COMPLETION((*o));
  66
  67 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  68     if (owner)
  69     {
  70       // Check whether buffers are still valid.
  71       buffer_sequence_adapter<boost::asio::mutable_buffer,
  72           MutableBufferSequence>::validate(o->buffers_);
  73     }
  74 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  75
  76     // Map non-portable errors to their portable counterparts.
  77     if (ec.value() == ERROR_HANDLE_EOF)
  78       ec = boost::asio::error::eof;
  79
  80     // Make a copy of the handler so that the memory can be deallocated before
  81     // the upcall is made. Even if we're not about to make an upcall, a
  82     // sub-object of the handler may be the true owner of the memory associated
  83     // with the handler. Consequently, a local copy of the handler is required
  84     // to ensure that any owning sub-object remains valid until after we have
  85     // deallocated the memory here.
  86     detail::binder2<Handler, boost::system::error_code, std::size_t>
  87       handler(o->handler_, ec, bytes_transferred);
  88     p.h = boost::asio::detail::addressof(handler.handler_);
  89     p.reset();
  90
  91     // Make the upcall if required.
  92     if (owner)
  93     {
  94       fenced_block b(fenced_block::half);
  95       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
  96       w.complete(handler, handler.handler_);
  97       BOOST_ASIO_HANDLER_INVOCATION_END;
  98     }
  99   }
 100
 101 private:
 102   MutableBufferSequence buffers_;
 103   Handler handler_;
 104   IoExecutor io_executor_;
 105 };
 106
 107 } // namespace detail
 108 } // namespace asio
 109 } // namespace boost
 110
 111 #include <boost/asio/detail/pop_options.hpp>
 112
 113 #endif // defined(BOOST_ASIO_HAS_IOCP)
 114
 115 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_READ_OP_HPP