Java语言深入－－对JAVA 的多线程浅析

现在是测试信号标志的程序：

class Process extends Thread{

String op;

Semaphore sem;

Process(String name,String op,Semaphore sem){

super(name);

this.op=op;

this.sem=sem;

start();

}

public void run(){

if(op.compareTo("read")==0){

System.out.println("Trying to get readLock:"+getName());

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