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

   1 //
   2 // detail/bulk_executor_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 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_BULK_EXECUTOR_OP_HPP
  12 #define BOOST_ASIO_DETAIL_BULK_EXECUTOR_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/fenced_block.hpp>
  21 #include <boost/asio/detail/handler_alloc_helpers.hpp>
  22 #include <boost/asio/detail/handler_invoke_helpers.hpp>
  23 #include <boost/asio/detail/scheduler_operation.hpp>
  24
  25 #include <boost/asio/detail/push_options.hpp>
  26
  27 namespace boost {
  28 namespace asio {
  29 namespace detail {
  30
  31 template <typename Handler, typename Alloc,
  32     typename Operation = scheduler_operation>
  33 class bulk_executor_op : public Operation
  34 {
  35 public:
  36   BOOST_ASIO_DEFINE_HANDLER_ALLOCATOR_PTR(bulk_executor_op);
  37
  38   template <typename H>
  39   bulk_executor_op(BOOST_ASIO_MOVE_ARG(H) h,
  40       const Alloc& allocator, std::size_t i)
  41     : Operation(&bulk_executor_op::do_complete),
  42       handler_(BOOST_ASIO_MOVE_CAST(H)(h)),
  43       allocator_(allocator),
  44       index_(i)
  45   {
  46   }
  47
  48   static void do_complete(void* owner, Operation* base,
  49       const boost::system::error_code& /*ec*/,
  50       std::size_t /*bytes_transferred*/)
  51   {
  52     // Take ownership of the handler object.
  53     bulk_executor_op* o(static_cast<bulk_executor_op*>(base));
  54     Alloc allocator(o->allocator_);
  55     ptr p = { detail::addressof(allocator), o, o };
  56
  57     BOOST_ASIO_HANDLER_COMPLETION((*o));
  58
  59     // Make a copy of the handler so that the memory can be deallocated before
  60     // the upcall is made. Even if we're not about to make an upcall, a
  61     // sub-object of the handler may be the true owner of the memory associated
  62     // with the handler. Consequently, a local copy of the handler is required
  63     // to ensure that any owning sub-object remains valid until after we have
  64     // deallocated the memory here.
  65     detail::binder1<Handler, std::size_t> handler(o->handler_, o->index_);
  66     p.reset();
  67
  68     // Make the upcall if required.
  69     if (owner)
  70     {
  71       fenced_block b(fenced_block::half);
  72       BOOST_ASIO_HANDLER_INVOCATION_BEGIN(());
  73       boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
  74       BOOST_ASIO_HANDLER_INVOCATION_END;
  75     }
  76   }
  77
  78 private:
  79   Handler handler_;
  80   Alloc allocator_;
  81   std::size_t index_;
  82 };
  83
  84 } // namespace detail
  85 } // namespace asio
  86 } // namespace boost
  87
  88 #include <boost/asio/detail/pop_options.hpp>
  89
  90 #endif // BOOST_ASIO_DETAIL_BULK_EXECUTOR_OP_HPP