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SSJ is a Java library for stochastic simulation, developed under the direction of Pierre L'Ecuyer, in the Département d'Informatique et de Recherche Opérationnelle (DIRO), at the Université de Montréal. It provides facilities for generating uniform and nonuniform random variates, computing different measures related to probability distributions, performing goodness-of-fit tests, applying quasi-Monte Carlo methods, collecting (elementary) statistics, and programming discrete-event simulations with both events and processes.

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/*
 * Class:        SystemTimeChrono
 * Description:  
 * Environment:  Java
 * Software:     SSJ 
 * Copyright (C) 2001  Pierre L'Ecuyer and Université de Montréal
 * Organization: DIRO, Université de Montréal
 * @author       Éric Buist
 * @since

 * SSJ is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License (GPL) as published by the
 * Free Software Foundation, either version 3 of the License, or
 * any later version.

 * SSJ 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.

 * A copy of the GNU General Public License is available at
   GPL licence site.
 */

package umontreal.iro.lecuyer.util;


/**
 * Extends the {@link AbstractChrono} class to compute
 * the total system time using Java's builtin System.nanoTime.
 * The system can be used as a rough approximation of the CPU time taken
 * by a program if no
 * other tasks are executed on the host while the program is running.
 * 
 */
public class SystemTimeChrono extends AbstractChrono {

   protected void getTime (long[] tab) {
      long rawTime = System.nanoTime();
      final long DIV = 1000000000L;
      long seconds = rawTime/DIV;
      long micros = (rawTime % DIV)/1000L;
      tab[0] = seconds;
      tab[1] = micros;
   }


   /**
    * Constructs a new chrono object and
    *     initializes it to zero.
    * 
    */
   public SystemTimeChrono() {
      super();
      init();
   }


}