boost/asio/detail/signal_handler.hpp
//
// detail/signal_handler.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_ASIO_DETAIL_SIGNAL_HANDLER_HPP
#define BOOST_ASIO_DETAIL_SIGNAL_HANDLER_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#include <boost/asio/detail/bind_handler.hpp>
#include <boost/asio/detail/fenced_block.hpp>
#include <boost/asio/detail/handler_alloc_helpers.hpp>
#include <boost/asio/detail/handler_invoke_helpers.hpp>
#include <boost/asio/detail/handler_work.hpp>
#include <boost/asio/detail/memory.hpp>
#include <boost/asio/detail/signal_op.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
template <typename Handler, typename IoExecutor>
class signal_handler : public signal_op
{
public:
BOOST_ASIO_DEFINE_HANDLER_PTR(signal_handler);
signal_handler(Handler& h, const IoExecutor& io_ex)
: signal_op(&signal_handler::do_complete),
handler_(BOOST_ASIO_MOVE_CAST(Handler)(h)),
io_executor_(io_ex)
{
handler_work<Handler, IoExecutor>::start(handler_, io_executor_);
}
static void do_complete(void* owner, operation* base,
const boost::system::error_code& /*ec*/,
std::size_t /*bytes_transferred*/)
{
// Take ownership of the handler object.
signal_handler* h(static_cast<signal_handler*>(base));
ptr p = { boost::asio::detail::addressof(h->handler_), h, h };
handler_work<Handler, IoExecutor> w(h->handler_, h->io_executor_);
BOOST_ASIO_HANDLER_COMPLETION((*h));
// Make a copy of the handler so that the memory can be deallocated before
// the upcall is made. Even if we're not about to make an upcall, a
// sub-object of the handler may be the true owner of the memory associated
// with the handler. Consequently, a local copy of the handler is required
// to ensure that any owning sub-object remains valid until after we have
// deallocated the memory here.
detail::binder2<Handler, boost::system::error_code, int>
handler(h->handler_, h->ec_, h->signal_number_);
p.h = boost::asio::detail::addressof(handler.handler_);
p.reset();
// Make the upcall if required.
if (owner)
{
fenced_block b(fenced_block::half);
BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
w.complete(handler, handler.handler_);
BOOST_ASIO_HANDLER_INVOCATION_END;
}
}
private:
Handler handler_;
IoExecutor io_executor_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_SIGNAL_HANDLER_HPP