semaphore.java

来自「将用户指定的数据保存成一个iso文件」· Java 代码 · 共 43 行

/*
 * Semaphore.java
 *
 * Created on February 16, 2004, 1:54 PM
 */

package jcdwriter.model;

/**
 *
 * @author  rmallappa
 */
public class Semaphore {
    
    int excessSignals = 0;
    /** Creates a new instance of Semaphore */
    public Semaphore() {
    }
    
    
    public synchronized void waitForSignal() {
        try {
            if (excessSignals > 0) {
//                System.out.println("Got signal without wait! Cool!");
            }
            else {
//                System.out.println("Waiting.");
                wait();
            }
        } catch (InterruptedException e) { }
        excessSignals = excessSignals - 1;
        notifyAll();
        return;
    }
    
    public synchronized void signal() {
        excessSignals = excessSignals + 1;
//        System.out.println("Gog a signal.");
        notifyAll();
    }
}