2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
4 * This file is part of CasparCG (www.casparcg.com).
6 * CasparCG 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 3 of the License, or
9 * (at your option) any later version.
11 * CasparCG 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 CasparCG. If not, see <http://www.gnu.org/licenses/>.
19 * Author: Robert Nagy, ronag89@gmail.com
22 #include "../../stdafx.h"
24 #include "../../prec_timer.h"
32 prec_timer::prec_timer()
37 void prec_timer::tick_millis(int64_t ticks_to_wait)
39 auto t = ::timeGetTime();
46 auto ticks_passed = t - time_;
47 auto ticks_left = ticks_to_wait - ticks_passed;
49 if (t < time_) // time wrap
51 if (ticks_passed >= ticks_to_wait)
56 // if > 0.002s left, do Sleep(1), which will actually sleep some
57 // steady amount, probably 1-2 ms,
58 // and do so in a nice way (cpu meter drops; laptop battery spared).
59 // otherwise, do a few Sleep(0)'s, which just give up the timeslice,
60 // but don't really save cpu or battery, but do pass a tiny
65 for (int i = 0; i < 10; ++i)
66 Sleep(0); // causes thread to give up its timeslice