code: public synchronized void start() {
  		if ((todoFlags & RECORD_CPUTIME) != 0) {
  			currentStartCpuTime = getThreadCpuTime(threadId);
  		} else {
  			currentStartCpuTime = -1;
  		}
  		if ((todoFlags & RECORD_WALLTIME) != 0) {
  			currentStartWallTime = System.nanoTime();
  		} else {
  			currentStartWallTime = -1;
  		}
  		isRunning = true;
  	}
docs: Start the timer.