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

   1 //
   2 // detail/descriptor_write_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2018 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_DESCRIPTOR_WRITE_OP_HPP
  12 #define BOOST_ASIO_DETAIL_DESCRIPTOR_WRITE_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) && !defined(__CYGWIN__)
  21
  22 #include <boost/asio/detail/bind_handler.hpp>
  23 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
  24 #include <boost/asio/detail/descriptor_ops.hpp>
  25 #include <boost/asio/detail/fenced_block.hpp>
  26 #include <boost/asio/detail/handler_work.hpp>
  27 #include <boost/asio/detail/memory.hpp>
  28 #include <boost/asio/detail/reactor_op.hpp>
  29
  30 #include <boost/asio/detail/push_options.hpp>
  31
  32 namespace boost {
  33 namespace asio {
  34 namespace detail {
  35
  36 template <typename ConstBufferSequence>
  37 class descriptor_write_op_base : public reactor_op
  38 {
  39 public:
  40   descriptor_write_op_base(int descriptor,
  41       const ConstBufferSequence& buffers, func_type complete_func)
  42     : reactor_op(&descriptor_write_op_base::do_perform, complete_func),
  43       descriptor_(descriptor),
  44       buffers_(buffers)
  45   {
  46   }
  47
  48   static status do_perform(reactor_op* base)
  49   {
  50     descriptor_write_op_base* o(static_cast<descriptor_write_op_base*>(base));
  51
  52     buffer_sequence_adapter<boost::asio::const_buffer,
  53         ConstBufferSequence> bufs(o->buffers_);
  54
  55     status result = descriptor_ops::non_blocking_write(o->descriptor_,
  56         bufs.buffers(), bufs.count(), o->ec_, o->bytes_transferred_)
  57       ? done : not_done;
  58
  59     BOOST_ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_write",
  60           o->ec_, o->bytes_transferred_));
  61
  62     return result;
  63   }
  64
  65 private:
  66   int descriptor_;
  67   ConstBufferSequence buffers_;
  68 };
  69
  70 template <typename ConstBufferSequence, typename Handler>
  71 class descriptor_write_op
  72   : public descriptor_write_op_base<ConstBufferSequence>
  73 {
  74 public:
  75   BOOST_ASIO_DEFINE_HANDLER_PTR(descriptor_write_op);
  76
  77   descriptor_write_op(int descriptor,
  78       const ConstBufferSequence& buffers, Handler& handler)
  79     : descriptor_write_op_base<ConstBufferSequence>(
  80         descriptor, buffers, &descriptor_write_op::do_complete),
  81       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
  82   {
  83     handler_work<Handler>::start(handler_);
  84   }
  85
  86   static void do_complete(void* owner, operation* base,
  87       const boost::system::error_code& /*ec*/,
  88       std::size_t /*bytes_transferred*/)
  89   {
  90     // Take ownership of the handler object.
  91     descriptor_write_op* o(static_cast<descriptor_write_op*>(base));
  92     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  93     handler_work<Handler> w(o->handler_);
  94
  95     BOOST_ASIO_HANDLER_COMPLETION((*o));
  96
  97     // Make a copy of the handler so that the memory can be deallocated before
  98     // the upcall is made. Even if we're not about to make an upcall, a
  99     // sub-object of the handler may be the true owner of the memory associated
 100     // with the handler. Consequently, a local copy of the handler is required
 101     // to ensure that any owning sub-object remains valid until after we have
 102     // deallocated the memory here.
 103     detail::binder2<Handler, boost::system::error_code, std::size_t>
 104       handler(o->handler_, o->ec_, o->bytes_transferred_);
 105     p.h = boost::asio::detail::addressof(handler.handler_);
 106     p.reset();
 107
 108     // Make the upcall if required.
 109     if (owner)
 110     {
 111       fenced_block b(fenced_block::half);
 112       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
 113       w.complete(handler, handler.handler_);
 114       BOOST_ASIO_HANDLER_INVOCATION_END;
 115     }
 116   }
 117
 118 private:
 119   Handler handler_;
 120 };
 121
 122 } // namespace detail
 123 } // namespace asio
 124 } // namespace boost
 125
 126 #include <boost/asio/detail/pop_options.hpp>
 127
 128 #endif // !defined(BOOST_ASIO_WINDOWS) && !defined(__CYGWIN__)
 129
 130 #endif // BOOST_ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP