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

   1 //
   2 // detail/reactive_socket_recv_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2019 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_REACTIVE_SOCKET_RECV_OP_HPP
  12 #define BOOST_ASIO_DETAIL_REACTIVE_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 #include <boost/asio/detail/bind_handler.hpp>
  20 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
  21 #include <boost/asio/detail/fenced_block.hpp>
  22 #include <boost/asio/detail/memory.hpp>
  23 #include <boost/asio/detail/reactor_op.hpp>
  24 #include <boost/asio/detail/socket_ops.hpp>
  25
  26 #include <boost/asio/detail/push_options.hpp>
  27
  28 namespace boost {
  29 namespace asio {
  30 namespace detail {
  31
  32 template <typename MutableBufferSequence>
  33 class reactive_socket_recv_op_base : public reactor_op
  34 {
  35 public:
  36   reactive_socket_recv_op_base(socket_type socket,
  37       socket_ops::state_type state, const MutableBufferSequence& buffers,
  38       socket_base::message_flags flags, func_type complete_func)
  39     : reactor_op(&reactive_socket_recv_op_base::do_perform, complete_func),
  40       socket_(socket),
  41       state_(state),
  42       buffers_(buffers),
  43       flags_(flags)
  44   {
  45   }
  46
  47   static status do_perform(reactor_op* base)
  48   {
  49     reactive_socket_recv_op_base* o(
  50         static_cast<reactive_socket_recv_op_base*>(base));
  51
  52     buffer_sequence_adapter<boost::asio::mutable_buffer,
  53         MutableBufferSequence> bufs(o->buffers_);
  54
  55     status result = socket_ops::non_blocking_recv(o->socket_,
  56         bufs.buffers(), bufs.count(), o->flags_,
  57         (o->state_ & socket_ops::stream_oriented) != 0,
  58         o->ec_, o->bytes_transferred_) ? done : not_done;
  59
  60     if (result == done)
  61       if ((o->state_ & socket_ops::stream_oriented) != 0)
  62         if (o->bytes_transferred_ == 0)
  63           result = done_and_exhausted;
  64
  65     BOOST_ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_recv",
  66           o->ec_, o->bytes_transferred_));
  67
  68     return result;
  69   }
  70
  71 private:
  72   socket_type socket_;
  73   socket_ops::state_type state_;
  74   MutableBufferSequence buffers_;
  75   socket_base::message_flags flags_;
  76 };
  77
  78 template <typename MutableBufferSequence, typename Handler, typename IoExecutor>
  79 class reactive_socket_recv_op :
  80   public reactive_socket_recv_op_base<MutableBufferSequence>
  81 {
  82 public:
  83   BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_socket_recv_op);
  84
  85   reactive_socket_recv_op(socket_type socket, socket_ops::state_type state,
  86       const MutableBufferSequence& buffers, socket_base::message_flags flags,
  87       Handler& handler, const IoExecutor& io_ex)
  88     : reactive_socket_recv_op_base<MutableBufferSequence>(socket, state,
  89         buffers, flags, &reactive_socket_recv_op::do_complete),
  90       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
  91       io_executor_(io_ex)
  92   {
  93     handler_work<Handler, IoExecutor>::start(handler_, io_executor_);
  94   }
  95
  96   static void do_complete(void* owner, operation* base,
  97       const boost::system::error_code& /*ec*/,
  98       std::size_t /*bytes_transferred*/)
  99   {
 100     // Take ownership of the handler object.
 101     reactive_socket_recv_op* o(static_cast<reactive_socket_recv_op*>(base));
 102     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
 103     handler_work<Handler, IoExecutor> w(o->handler_, o->io_executor_);
 104
 105     BOOST_ASIO_HANDLER_COMPLETION((*o));
 106
 107     // Make a copy of the handler so that the memory can be deallocated before
 108     // the upcall is made. Even if we're not about to make an upcall, a
 109     // sub-object of the handler may be the true owner of the memory associated
 110     // with the handler. Consequently, a local copy of the handler is required
 111     // to ensure that any owning sub-object remains valid until after we have
 112     // deallocated the memory here.
 113     detail::binder2<Handler, boost::system::error_code, std::size_t>
 114       handler(o->handler_, o->ec_, o->bytes_transferred_);
 115     p.h = boost::asio::detail::addressof(handler.handler_);
 116     p.reset();
 117
 118     // Make the upcall if required.
 119     if (owner)
 120     {
 121       fenced_block b(fenced_block::half);
 122       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
 123       w.complete(handler, handler.handler_);
 124       BOOST_ASIO_HANDLER_INVOCATION_END;
 125     }
 126   }
 127
 128 private:
 129   Handler handler_;
 130   IoExecutor io_executor_;
 131 };
 132
 133 } // namespace detail
 134 } // namespace asio
 135 } // namespace boost
 136
 137 #include <boost/asio/detail/pop_options.hpp>
 138
 139 #endif // BOOST_ASIO_DETAIL_REACTIVE_SOCKET_RECV_OP_HPP