code: protected void cancelRunningChildren (int startIndex) {
  		for (int i = startIndex, n = getChildCount(); i < n; i++) {
  			Task<E> child = getChild(i);
  			if (child.status == Status.RUNNING) child.cancel();
  		}
  	}
docs: Terminates the running children of this task starting from the specified index up to the end.
  @param startIndex the start index