// | |
// detail/wait_handler.hpp | |
// ~~~~~~~~~~~~~~~~~~~~~~~ | |
// | |
// Copyright (c) 2003-2011 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_WAIT_HANDLER_HPP | |
#define BOOST_ASIO_DETAIL_WAIT_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/fenced_block.hpp> | |
#include <boost/asio/detail/handler_alloc_helpers.hpp> | |
#include <boost/asio/detail/handler_invoke_helpers.hpp> | |
#include <boost/asio/detail/timer_op.hpp> | |
#include <boost/asio/detail/push_options.hpp> | |
namespace boost { | |
namespace asio { | |
namespace detail { | |
template <typename Handler> | |
class wait_handler : public timer_op | |
{ | |
public: | |
BOOST_ASIO_DEFINE_HANDLER_PTR(wait_handler); | |
wait_handler(Handler h) | |
: timer_op(&wait_handler::do_complete), | |
handler_(h) | |
{ | |
} | |
static void do_complete(io_service_impl* owner, operation* base, | |
boost::system::error_code /*ec*/, std::size_t /*bytes_transferred*/) | |
{ | |
// Take ownership of the handler object. | |
wait_handler* h(static_cast<wait_handler*>(base)); | |
ptr p = { boost::addressof(h->handler_), h, 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::binder1<Handler, boost::system::error_code> | |
handler(h->handler_, h->ec_); | |
p.h = boost::addressof(handler.handler_); | |
p.reset(); | |
// Make the upcall if required. | |
if (owner) | |
{ | |
boost::asio::detail::fenced_block b; | |
boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_); | |
} | |
} | |
private: | |
Handler handler_; | |
}; | |
} // namespace detail | |
} // namespace asio | |
} // namespace boost | |
#include <boost/asio/detail/pop_options.hpp> | |
#endif // BOOST_ASIO_DETAIL_WAIT_HANDLER_HPP |