semaphore.java

通过线程控制来打印出julia集

public class Semaphore {

	protected int value;

	public Semaphore(int v) {
		value = v;
	}

	public synchronized void P() {
		while (value <= 0) {
			try {
				wait();
			} catch (InterruptedException e) {
			}
		}
		value--;
	}

	public synchronized void V() {
		++value;
		notify();
	}
}