roundscheduler.java

操作系统的线程模拟程序

import java.util.Random ;

public class RoundScheduler extends Scheduler {

	public int quant ;
	private int pronow ;

    public RoundScheduler() {
    	quant =1 ;
    	pronow=0;
    }

    public synchronized void run() {
	while (true) {
  	    int noProcs = processList.size() ;
	    if (noProcs == 0) System.exit(0) ;
	    int next = (pronow)%noProcs ;pronow++;
	   // for(int i=0;i<noProcs;)
	    SimProc nextRunner = (SimProc) processList.elementAt(next) ;
	    synchronized(nextRunner) { nextRunner.notify() ;}
   	    try { wait() ;}
	    catch (Exception e) { 
		System.out.println("Unexpected interrupt in run " + e) ; 
	    }
	}
    }
}