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

   1 //
   2 // detail/win_iocp_socket_recvmsg_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2022 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_RECVMSG_OP_HPP
  12 #define BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVMSG_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 #include <boost/asio/socket_base.hpp>
  33
  34 #include <boost/asio/detail/push_options.hpp>
  35
  36 namespace boost {
  37 namespace asio {
  38 namespace detail {
  39
  40 template <typename MutableBufferSequence, typename Handler, typename IoExecutor>
  41 class win_iocp_socket_recvmsg_op : public operation
  42 {
  43 public:
  44   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_recvmsg_op);
  45
  46   win_iocp_socket_recvmsg_op(
  47       socket_ops::weak_cancel_token_type cancel_token,
  48       const MutableBufferSequence& buffers,
  49       socket_base::message_flags& out_flags,
  50       Handler& handler, const IoExecutor& io_ex)
  51     : operation(&win_iocp_socket_recvmsg_op::do_complete),
  52       cancel_token_(cancel_token),
  53       buffers_(buffers),
  54       out_flags_(out_flags),
  55       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
  56       work_(handler_, io_ex)
  57   {
  58   }
  59
  60   static void do_complete(void* owner, operation* base,
  61       const boost::system::error_code& result_ec,
  62       std::size_t bytes_transferred)
  63   {
  64     boost::system::error_code ec(result_ec);
  65
  66     // Take ownership of the operation object.
  67     win_iocp_socket_recvmsg_op* o(
  68         static_cast<win_iocp_socket_recvmsg_op*>(base));
  69     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  70
  71     BOOST_ASIO_HANDLER_COMPLETION((*o));
  72
  73     // Take ownership of the operation's outstanding work.
  74     handler_work<Handler, IoExecutor> w(
  75         BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
  76           o->work_));
  77
  78 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  79     // Check whether buffers are still valid.
  80     if (owner)
  81     {
  82       buffer_sequence_adapter<boost::asio::mutable_buffer,
  83           MutableBufferSequence>::validate(o->buffers_);
  84     }
  85 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  86
  87     socket_ops::complete_iocp_recvmsg(o->cancel_token_, ec);
  88     o->out_flags_ = 0;
  89
  90     // Make a copy of the handler so that the memory can be deallocated before
  91     // the upcall is made. Even if we're not about to make an upcall, a
  92     // sub-object of the handler may be the true owner of the memory associated
  93     // with the handler. Consequently, a local copy of the handler is required
  94     // to ensure that any owning sub-object remains valid until after we have
  95     // deallocated the memory here.
  96     detail::binder2<Handler, boost::system::error_code, std::size_t>
  97       handler(o->handler_, ec, bytes_transferred);
  98     p.h = boost::asio::detail::addressof(handler.handler_);
  99     p.reset();
 100
 101     // Make the upcall if required.
 102     if (owner)
 103     {
 104       fenced_block b(fenced_block::half);
 105       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
 106       w.complete(handler, handler.handler_);
 107       BOOST_ASIO_HANDLER_INVOCATION_END;
 108     }
 109   }
 110
 111 private:
 112   socket_ops::weak_cancel_token_type cancel_token_;
 113   MutableBufferSequence buffers_;
 114   socket_base::message_flags& out_flags_;
 115   Handler handler_;
 116   handler_work<Handler, IoExecutor> work_;
 117 };
 118
 119 } // namespace detail
 120 } // namespace asio
 121 } // namespace boost
 122
 123 #include <boost/asio/detail/pop_options.hpp>
 124
 125 #endif // defined(BOOST_ASIO_HAS_IOCP)
 126
 127 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVMSG_OP_HPP