2 Copyright (C) 2017-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 #ifndef DCPOMATIC_EVENT_HISTORY_H
23 #define DCPOMATIC_EVENT_HISTORY_H
26 #include <boost/thread/mutex.hpp>
27 #include <boost/optional.hpp>
34 explicit EventHistory (int size);
36 boost::optional<float> rate () const;
40 /** Mutex for _history */
41 mutable boost::mutex _mutex;
42 /** List of the times of the last _history_size events
43 first is the most recently completed.
45 std::list<struct timeval> _history;
46 /** Number of events that we should keep history for */