package testurt;import jopurt.*;import util.Dbg;import util.Timer;public class RoundRobin extends Scheduler {	/**	*	test threads	*/	static class Work extends RtUserThread {		int c;		Work(int ch) {			super(5, 100000);			c = ch;		}		public void run() {			for (;;) {				Dbg.wr(c);				// busy wait to simulate				// 3 ms workload in Work.				int ts = Scheduler.getNow();				ts += 3000;				while (ts-Scheduler.getNow()>0)					;			}		}	}	//	//	user scheduler starts here	//	public void RoundRobin() {	}	public void addTask(Task t) {		// we do not allow tasks		// to be added after start()	}	//	//	called by JVM	//	public void schedule() {		RtUserThread th = active.next;		if (th==null) th = RtUserThread.head;		dispatch(th, getNow()+10000);	}	public static void main(String[] args) {		Dbg.initSer();				// use serial line for debug output		new Work('a');		new Work('b');		new Work('c');		RoundRobin rr = new RoundRobin();		rr.start();		// sleep		for (;;) {			Dbg.wr('M');			Timer.wd();			RtUserThread.sleepMs(1200);		}	}}