timer.java

对于CPU线程调度的模拟

package simcpu;

public class Timer {
	int sum=0;
	int mark=0;
	boolean timing=false;
	
	public void reset() {
		sum=0;
		mark=0;
		timing=false;
	}
	
	public void start(int now) {
		timing=true;
		mark=now;
	}
	
	public void stop(int now) {
		timing=false;
		sum+=now-mark;
	}
	
	public int read() {
		return sum;
	}
}