Dave Hoover
120e9c0db9
git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@119 ed5b42cb-e716-0410-a449-f6a68f950b19
70 lines
2.2 KiB
Java
70 lines
2.2 KiB
Java
//
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// $Id$
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//
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// Narya library - tools for developing networked games
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// Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
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// http://www.threerings.net/code/narya/
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library 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 GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.threerings.media.timer;
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import sun.misc.Perf;
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import com.threerings.media.Log;
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/**
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* A timer that uses the performance clock exposed by Sun in JDK 1.4.2.
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*/
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public class PerfTimer implements MediaTimer
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{
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public PerfTimer ()
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{
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_timer = Perf.getPerf();
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_mfrequency = _timer.highResFrequency() / 1000;
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_ufrequency = _timer.highResFrequency() / 1000000;
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_startStamp = _timer.highResCounter();
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Log.info("Using high performance timer [mfreq=" + _mfrequency +
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", ufreq=" + _ufrequency + ", start=" + _startStamp + "].");
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}
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// documentation inherited from interface
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public void reset ()
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{
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_startStamp = _timer.highResCounter();
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}
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// documentation inherited from interface
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public long getElapsedMillis ()
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{
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return (_timer.highResCounter() - _startStamp) / _mfrequency;
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}
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// documentation inherited from interface
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public long getElapsedMicros ()
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{
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return (_timer.highResCounter() - _startStamp) / _ufrequency;
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}
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/** A performance timer object. */
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protected Perf _timer;
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/** The time at which this timer was last reset. */
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protected long _startStamp;
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/** The timer frequencies. */
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protected long _mfrequency, _ufrequency;
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}
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