JAVA线程锁-读写锁

 

　　JAVA线程锁，除Lock的传统锁，又有两种特殊锁，叫读写锁ReadWriteLock

　　其中多个读锁不互斥，读锁和写锁互斥，写锁和写锁互斥

例子：

/**
 * java线程锁分为读写锁 ReadWriteLock 其中多个读锁不互斥，读锁和写锁互斥，写锁和写锁互斥
 * 
 * @author
 * 
 * 
 *
 */
public class ReadWriteLockTest {

    public static void main(String[] args) {
        final Operation operation = new Operation();
        for (int i = 1; i <= 3; i++) {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    operation.getData();
                }
            }).start();

            new Thread(new Runnable() {
                @Override
                public void run() {
                    operation.putData(new Random().nextInt(1000));
                }
            }).start();
        }
    }

}
class Operation{
    private ReadWriteLock rwl = new ReentrantReadWriteLock();    //读写锁
    private int data;
    public void getData(){
        rwl.readLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+" be readly get data ");
            Thread.sleep(1000);
            System.out.println(Thread.currentThread().getName()+" have data value :" + data);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally{
            rwl.readLock().unlock();
        }
    }
    public void putData(int data){
        rwl.writeLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+" be readly write data");
            Thread.sleep(1000);
            this.data = data;
            System.out.println(Thread.currentThread().getName() + " have write data value : "+ data);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally{
            rwl.writeLock().unlock();
        }
    }
}