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

   1 //
   2 // detail/descriptor_write_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2016 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/addressof.hpp>
  23 #include <boost/asio/detail/bind_handler.hpp>
  24 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
  25 #include <boost/asio/detail/descriptor_ops.hpp>
  26 #include <boost/asio/detail/fenced_block.hpp>
  27 #include <boost/asio/detail/reactor_op.hpp>
  28
  29 #include <boost/asio/detail/push_options.hpp>
  30
  31 namespace boost {
  32 namespace asio {
  33 namespace detail {
  34
  35 template <typename ConstBufferSequence>
  36 class descriptor_write_op_base : public reactor_op
  37 {
  38 public:
  39   descriptor_write_op_base(int descriptor,
  40       const ConstBufferSequence& buffers, func_type complete_func)
  41     : reactor_op(&descriptor_write_op_base::do_perform, complete_func),
  42       descriptor_(descriptor),
  43       buffers_(buffers)
  44   {
  45   }
  46
  47   static bool do_perform(reactor_op* base)
  48   {
  49     descriptor_write_op_base* o(static_cast<descriptor_write_op_base*>(base));
  50
  51     buffer_sequence_adapter<boost::asio::const_buffer,
  52         ConstBufferSequence> bufs(o->buffers_);
  53
  54     return descriptor_ops::non_blocking_write(o->descriptor_,
  55         bufs.buffers(), bufs.count(), o->ec_, o->bytes_transferred_);
  56   }
  57
  58 private:
  59   int descriptor_;
  60   ConstBufferSequence buffers_;
  61 };
  62
  63 template <typename ConstBufferSequence, typename Handler>
  64 class descriptor_write_op
  65   : public descriptor_write_op_base<ConstBufferSequence>
  66 {
  67 public:
  68   BOOST_ASIO_DEFINE_HANDLER_PTR(descriptor_write_op);
  69
  70   descriptor_write_op(int descriptor,
  71       const ConstBufferSequence& buffers, Handler& handler)
  72     : descriptor_write_op_base<ConstBufferSequence>(
  73         descriptor, buffers, &descriptor_write_op::do_complete),
  74       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
  75   {
  76   }
  77
  78   static void do_complete(io_service_impl* owner, operation* base,
  79       const boost::system::error_code& /*ec*/,
  80       std::size_t /*bytes_transferred*/)
  81   {
  82     // Take ownership of the handler object.
  83     descriptor_write_op* o(static_cast<descriptor_write_op*>(base));
  84     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  85
  86     BOOST_ASIO_HANDLER_COMPLETION((o));
  87
  88     // Make a copy of the handler so that the memory can be deallocated before
  89     // the upcall is made. Even if we're not about to make an upcall, a
  90     // sub-object of the handler may be the true owner of the memory associated
  91     // with the handler. Consequently, a local copy of the handler is required
  92     // to ensure that any owning sub-object remains valid until after we have
  93     // deallocated the memory here.
  94     detail::binder2<Handler, boost::system::error_code, std::size_t>
  95       handler(o->handler_, o->ec_, o->bytes_transferred_);
  96     p.h = boost::asio::detail::addressof(handler.handler_);
  97     p.reset();
  98
  99     // Make the upcall if required.
 100     if (owner)
 101     {
 102       fenced_block b(fenced_block::half);
 103       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
 104       boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
 105       BOOST_ASIO_HANDLER_INVOCATION_END;
 106     }
 107   }
 108
 109 private:
 110   Handler handler_;
 111 };
 112
 113 } // namespace detail
 114 } // namespace asio
 115 } // namespace boost
 116
 117 #include <boost/asio/detail/pop_options.hpp>
 118
 119 #endif // !defined(BOOST_ASIO_WINDOWS) && !defined(__CYGWIN__)
 120
 121 #endif // BOOST_ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP