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

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