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

   1 //
   2 // detail/reactive_socket_recvmsg_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2022 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_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/handler_alloc_helpers.hpp>
  23 #include <boost/asio/detail/handler_invoke_helpers.hpp>
  24 #include <boost/asio/detail/handler_work.hpp>
  25 #include <boost/asio/detail/memory.hpp>
  26 #include <boost/asio/detail/reactor_op.hpp>
  27 #include <boost/asio/detail/socket_ops.hpp>
  28 #include <boost/asio/socket_base.hpp>
  29
  30 #include <boost/asio/detail/push_options.hpp>
  31
  32 namespace boost {
  33 namespace asio {
  34 namespace detail {
  35
  36 template <typename MutableBufferSequence>
  37 class reactive_socket_recvmsg_op_base : public reactor_op
  38 {
  39 public:
  40   reactive_socket_recvmsg_op_base(const boost::system::error_code& success_ec,
  41       socket_type socket, const MutableBufferSequence& buffers,
  42       socket_base::message_flags in_flags,
  43       socket_base::message_flags& out_flags, func_type complete_func)
  44     : reactor_op(success_ec,
  45         &reactive_socket_recvmsg_op_base::do_perform, complete_func),
  46       socket_(socket),
  47       buffers_(buffers),
  48       in_flags_(in_flags),
  49       out_flags_(out_flags)
  50   {
  51   }
  52
  53   static status do_perform(reactor_op* base)
  54   {
  55     reactive_socket_recvmsg_op_base* o(
  56         static_cast<reactive_socket_recvmsg_op_base*>(base));
  57
  58     buffer_sequence_adapter<boost::asio::mutable_buffer,
  59         MutableBufferSequence> bufs(o->buffers_);
  60
  61     status result = socket_ops::non_blocking_recvmsg(o->socket_,
  62         bufs.buffers(), bufs.count(),
  63         o->in_flags_, o->out_flags_,
  64         o->ec_, o->bytes_transferred_) ? done : not_done;
  65
  66     BOOST_ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_recvmsg",
  67           o->ec_, o->bytes_transferred_));
  68
  69     return result;
  70   }
  71
  72 private:
  73   socket_type socket_;
  74   MutableBufferSequence buffers_;
  75   socket_base::message_flags in_flags_;
  76   socket_base::message_flags& out_flags_;
  77 };
  78
  79 template <typename MutableBufferSequence, typename Handler, typename IoExecutor>
  80 class reactive_socket_recvmsg_op :
  81   public reactive_socket_recvmsg_op_base<MutableBufferSequence>
  82 {
  83 public:
  84   BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_socket_recvmsg_op);
  85
  86   reactive_socket_recvmsg_op(const boost::system::error_code& success_ec,
  87       socket_type socket, const MutableBufferSequence& buffers,
  88       socket_base::message_flags in_flags,
  89       socket_base::message_flags& out_flags, Handler& handler,
  90       const IoExecutor& io_ex)
  91     : reactive_socket_recvmsg_op_base<MutableBufferSequence>(
  92         success_ec, socket, buffers, in_flags, out_flags,
  93         &reactive_socket_recvmsg_op::do_complete),
  94       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
  95       work_(handler_, io_ex)
  96   {
  97   }
  98
  99   static void do_complete(void* owner, operation* base,
 100       const boost::system::error_code& /*ec*/,
 101       std::size_t /*bytes_transferred*/)
 102   {
 103     // Take ownership of the handler object.
 104     reactive_socket_recvmsg_op* o(
 105         static_cast<reactive_socket_recvmsg_op*>(base));
 106     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
 107
 108     BOOST_ASIO_HANDLER_COMPLETION((*o));
 109
 110     // Take ownership of the operation's outstanding work.
 111     handler_work<Handler, IoExecutor> w(
 112         BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
 113           o->work_));
 114
 115     // Make a copy of the handler so that the memory can be deallocated before
 116     // the upcall is made. Even if we're not about to make an upcall, a
 117     // sub-object of the handler may be the true owner of the memory associated
 118     // with the handler. Consequently, a local copy of the handler is required
 119     // to ensure that any owning sub-object remains valid until after we have
 120     // deallocated the memory here.
 121     detail::binder2<Handler, boost::system::error_code, std::size_t>
 122       handler(o->handler_, o->ec_, o->bytes_transferred_);
 123     p.h = boost::asio::detail::addressof(handler.handler_);
 124     p.reset();
 125
 126     // Make the upcall if required.
 127     if (owner)
 128     {
 129       fenced_block b(fenced_block::half);
 130       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
 131       w.complete(handler, handler.handler_);
 132       BOOST_ASIO_HANDLER_INVOCATION_END;
 133     }
 134   }
 135
 136 private:
 137   Handler handler_;
 138   handler_work<Handler, IoExecutor> work_;
 139 };
 140
 141 } // namespace detail
 142 } // namespace asio
 143 } // namespace boost
 144
 145 #include <boost/asio/detail/pop_options.hpp>
 146
 147 #endif // BOOST_ASIO_DETAIL_REACTIVE_SOCKET_RECVMSG_OP_HPP