2 Copyright (C) 2017-2019 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/>.
21 #ifndef DCPOMATIC_EVENT_HISTORY_H
22 #define DCPOMATIC_EVENT_HISTORY_H
24 #include <boost/thread/mutex.hpp>
25 #include <boost/optional.hpp>
31 explicit EventHistory (int size);
33 boost::optional<float> rate () const;
37 /** Mutex for _history */
38 mutable boost::mutex _mutex;
39 /** List of the times of the last _history_size events
40 first is the most recently completed.
42 std::list<struct timeval> _history;
43 /** Number of events that we should keep history for */