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();
   }


}