Java并发编程六读写锁

  • Z时代
  • 2024-01-10
  • 分类：综合

编程

1、读写互斥

public class Test {
//true 为公平锁，false为重入锁
public   static ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
    public   static Lock readLock = lock.readLock();
    public   static Lock writeLock = lock.writeLock();
    public static void main(String [] args) throws InterruptedException {
        ThreadJoinTest t1 = new ThreadJoinTest("李雷");
ThreadJoinTest t2 = new ThreadJoinTest("韩梅梅");
ThreadJoinTest t3 = new ThreadJoinTest("露西");
ThreadJoinTest t4 = new ThreadJoinTest("莉莉");
t1.start();
t2.start();
t4.start();
ThreadUtil.sleep(100);
t3.start();
System.out.println("Main thread is finished");
}
}
class ThreadJoinTest extends Thread{
public ThreadJoinTest(String name){
super(name);
}
@Override
public void  run(){
if(this.getName() .equals("露西")){
            Test.writeLock.lock();
}else{
            Test.readLock.lock();
}
for(int i=0;i<3;i++){
              System.out.println(this.getName() + ":" + DateUtil.formatTime(new Date()));
ThreadUtil.sleep(1000);
}
if(this.getName() .equals("露西")){
            Test.writeLock.unlock();
}else {
            Test.readLock.unlock();
}
    }
}

执行结果 读的时候写无法操作，读读可以同时执行

韩梅梅:16:49:23
李雷:16:49:23
莉莉:16:49:23
韩梅梅:16:49:24
李雷:16:49:24
莉莉:16:49:24
韩梅梅:16:49:25
李雷:16:49:25
莉莉:16:49:25
露西:16:49:26
露西:16:49:27
露西:16:49:28

二 写写互斥 

public class Test {
//true 为公平锁，false为重入锁
public   static ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
    public   static Lock readLock = lock.readLock();
    public   static Lock writeLock = lock.writeLock();
    public static void main(String [] args) throws InterruptedException {
        ThreadJoinTest t1 = new ThreadJoinTest("李雷");
ThreadJoinTest t2 = new ThreadJoinTest("韩梅梅");
ThreadJoinTest t3 = new ThreadJoinTest("露西");
ThreadJoinTest t4 = new ThreadJoinTest("莉莉");
t1.start();
t2.start();
t4.start();
t3.start();
System.out.println("Main thread is finished");
}
}
class ThreadJoinTest extends Thread{
public ThreadJoinTest(String name){
super(name);
}
@Override
public void  run(){
        Test.writeLock.lock();
          for(int i=0;i<3;i++){
              System.out.println(this.getName() + ":" + DateUtil.formatTime(new Date()));
ThreadUtil.sleep(1000);
}
        Test.writeLock.unlock();
}
}

执行结果  可以看到写与写无法同时进行

莉莉:16:59:03
莉莉:16:59:04
莉莉:16:59:05
露西:16:59:06
露西:16:59:07
露西:16:59:08
李雷:16:59:09
李雷:16:59:10
李雷:16:59:11
韩梅梅:16:59:12
韩梅梅:16:59:13
韩梅梅:16:59:14

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