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

   1 //
   2 // detail/winrt_socket_recv_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 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_WINRT_SOCKET_RECV_OP_HPP
  12 #define BOOST_ASIO_DETAIL_WINRT_SOCKET_RECV_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_WINDOWS_RUNTIME)
  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/memory.hpp>
  28 #include <boost/asio/detail/winrt_async_op.hpp>
  29 #include <boost/asio/error.hpp>
  30
  31 #include <boost/asio/detail/push_options.hpp>
  32
  33 namespace boost {
  34 namespace asio {
  35 namespace detail {
  36
  37 template <typename MutableBufferSequence, typename Handler>
  38 class winrt_socket_recv_op :
  39   public winrt_async_op<Windows::Storage::Streams::IBuffer^>
  40 {
  41 public:
  42   BOOST_ASIO_DEFINE_HANDLER_PTR(winrt_socket_recv_op);
  43
  44   winrt_socket_recv_op(const MutableBufferSequence& buffers, Handler& handler)
  45     : winrt_async_op<Windows::Storage::Streams::IBuffer^>(
  46           &winrt_socket_recv_op::do_complete),
  47       buffers_(buffers),
  48       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
  49   {
  50     handler_work<Handler>::start(handler_);
  51   }
  52
  53   static void do_complete(void* owner, operation* base,
  54       const boost::system::error_code&, std::size_t)
  55   {
  56     // Take ownership of the operation object.
  57     winrt_socket_recv_op* o(static_cast<winrt_socket_recv_op*>(base));
  58     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  59     handler_work<Handler> w(o->handler_);
  60
  61     BOOST_ASIO_HANDLER_COMPLETION((*o));
  62
  63 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  64     // Check whether buffers are still valid.
  65     if (owner)
  66     {
  67       buffer_sequence_adapter<boost::asio::mutable_buffer,
  68           MutableBufferSequence>::validate(o->buffers_);
  69     }
  70 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  71
  72     std::size_t bytes_transferred = o->result_ ? o->result_->Length : 0;
  73     if (bytes_transferred == 0 && !o->ec_ &&
  74         !buffer_sequence_adapter<boost::asio::mutable_buffer,
  75           MutableBufferSequence>::all_empty(o->buffers_))
  76     {
  77       o->ec_ = boost::asio::error::eof;
  78     }
  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_, o->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 };
 105
 106 } // namespace detail
 107 } // namespace asio
 108 } // namespace boost
 109
 110 #include <boost/asio/detail/pop_options.hpp>
 111
 112 #endif // defined(BOOST_ASIO_WINDOWS_RUNTIME)
 113
 114 #endif // BOOST_ASIO_DETAIL_WINRT_SOCKET_RECV_OP_HPP