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 #include "event_history.h"
23 #include <boost/thread/mutex.hpp>
29 using boost::optional;
32 EventHistory::EventHistory (int size)
39 EventHistory::rate () const
41 boost::mutex::scoped_lock lock (_mutex);
42 if (int (_history.size()) < _size) {
43 return optional<float>();
47 for (list<pair<struct timeval, int> >::const_iterator i = _history.begin(); i != _history.end(); ++i) {
52 gettimeofday (&now, 0);
54 return total / (seconds(now) - seconds(_history.back().first));
58 EventHistory::event (int count)
60 boost::mutex::scoped_lock lock (_mutex);
63 gettimeofday (&tv, 0);
64 _history.push_front (make_pair(tv, count));
65 if (int(_history.size()) > _size) {