/*
* TimingUtils.java
* Copyright (C) 2007 University of Waikato, Hamilton, New Zealand
* @author Richard Kirkby (rkirkby@cs.waikato.ac.nz)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package tr.gov.ulakbim.jDenetX.core;
public class TimingUtils {
protected static boolean preciseThreadTimesAvailable = false;
public static boolean enablePreciseTiming() {
if (!preciseThreadTimesAvailable) {
try {
java.lang.management.ThreadMXBean tmxb = java.lang.management.ManagementFactory
.getThreadMXBean();
if (tmxb.isCurrentThreadCpuTimeSupported()) {
tmxb.setThreadCpuTimeEnabled(true);
preciseThreadTimesAvailable = true;
}
} catch (Throwable e) {
// ignore problems, just resort to inaccurate timing
}
}
return preciseThreadTimesAvailable;
}
public static long getNanoCPUTimeOfCurrentThread() {
return getNanoCPUTimeOfThread(Thread.currentThread().getId());
}
public static long getNanoCPUTimeOfThread(long threadID) {
if (preciseThreadTimesAvailable) {
long time = java.lang.management.ManagementFactory
.getThreadMXBean().getThreadCpuTime(threadID);
if (time != -1) {
return time;
}
}
return System.nanoTime();
}
public static double nanoTimeToSeconds(long nanoTime) {
return nanoTime / 1000000000.0;
}
}