mirror of https://github.com/bsnes-emu/bsnes.git
57 lines
2.2 KiB
C++
Executable File
57 lines
2.2 KiB
C++
Executable File
/***************************************************************************
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* Copyright (C) 2008 by Sindre Aamås *
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* aamas@stud.ntnu.no *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License version 2 as *
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* published by the Free Software Foundation. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License version 2 for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* version 2 along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include "adaptivesleep.h"
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usec_t AdaptiveSleep::sleepUntil(usec_t base, usec_t inc) {
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usec_t now = getusecs();
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usec_t diff = now - base;
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if (diff >= inc)
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return diff - inc;
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diff = inc - diff;
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if (diff > oversleep + oversleepVar) {
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diff -= oversleep + oversleepVar;
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usecsleep(diff);
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const usec_t ideal = now + diff;
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now = getusecs();
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{
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usec_t curOversleep = now - ideal;
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if (negate(curOversleep) < curOversleep)
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curOversleep = 0;
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oversleepVar = (oversleepVar * 15 + (curOversleep < oversleep ? oversleep - curOversleep : curOversleep - oversleep)) >> 4;
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oversleep = (oversleep * 15 + curOversleep) >> 4;
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}
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noSleep = 60;
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} else if (--noSleep == 0) {
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noSleep = 60;
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oversleep = oversleepVar = 0;
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}
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while (now - base < inc)
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now = getusecs();
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return 0;
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}
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