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

   1 //
   2 // detail/signal_handler.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_SIGNAL_HANDLER_HPP
  12 #define BOOST_ASIO_DETAIL_SIGNAL_HANDLER_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/addressof.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/signal_op.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>
  32 class signal_handler : public signal_op
  33 {
  34 public:
  35   BOOST_ASIO_DEFINE_HANDLER_PTR(signal_handler);
  36
  37   signal_handler(Handler& h)
  38     : signal_op(&signal_handler::do_complete),
  39       handler_(BOOST_ASIO_MOVE_CAST(Handler)(h))
  40   {
  41   }
  42
  43   static void do_complete(io_service_impl* owner, operation* base,
  44       const boost::system::error_code& /*ec*/,
  45       std::size_t /*bytes_transferred*/)
  46   {
  47     // Take ownership of the handler object.
  48     signal_handler* h(static_cast<signal_handler*>(base));
  49     ptr p = { boost::asio::detail::addressof(h->handler_), h, h };
  50
  51     BOOST_ASIO_HANDLER_COMPLETION((h));
  52
  53     // Make a copy of the handler so that the memory can be deallocated before
  54     // the upcall is made. Even if we're not about to make an upcall, a
  55     // sub-object of the handler may be the true owner of the memory associated
  56     // with the handler. Consequently, a local copy of the handler is required
  57     // to ensure that any owning sub-object remains valid until after we have
  58     // deallocated the memory here.
  59     detail::binder2<Handler, boost::system::error_code, int>
  60       handler(h->handler_, h->ec_, h->signal_number_);
  61     p.h = boost::asio::detail::addressof(handler.handler_);
  62     p.reset();
  63
  64     // Make the upcall if required.
  65     if (owner)
  66     {
  67       fenced_block b(fenced_block::half);
  68       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
  69       boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
  70       BOOST_ASIO_HANDLER_INVOCATION_END;
  71     }
  72   }
  73
  74 private:
  75   Handler handler_;
  76 };
  77
  78 } // namespace detail
  79 } // namespace asio
  80 } // namespace boost
  81
  82 #include <boost/asio/detail/pop_options.hpp>
  83
  84 #endif // BOOST_ASIO_DETAIL_SIGNAL_HANDLER_HPP