import java.util.concurrent.locks.ReentrantReadWriteLock;
public class TestRWL {
public static void main(String[] args) {
RWL r = new RWL();
for (int i = 0; i < 3; i++) {
new Thread() {
public void run() {
while (true) {
r.read();
}
}
}.start();
}
for (int i = 0; i < 3; i++) {
new Thread() {
public void run() {
while (true) {
r.write((int) (Math.random() * 1000));
}
}
}.start();
}
}
}
class RWL {
private int data = 0;// 共享数据，只能有一个线程能写该数据，但可有多个线程同时读该数据。
private ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
public void read() {
rwl.readLock().lock();// 上读锁，其他线程只可读不可写
try {
System.out.println(Thread.currentThread().getName() + "读取数据:" + data);
Thread.sleep((long) (Math.random() * 1000));
} catch (Exception e) {
e.printStackTrace();
} finally {
rwl.readLock().unlock();// 释放读锁，最好放在finnaly里面
}
}
public void write(int data) {
rwl.writeLock().lock();// 上写锁，其他线程不可读不可写
this.data = data;
try {
System.out.println(Thread.currentThread().getName() + "写入数据:" + data);
Thread.sleep((long) (Math.random() * 1000));
} catch (Exception e) {
e.printStackTrace();
} finally {
rwl.writeLock().unlock();// 释放写锁，最好放在finnaly里面
}
}
}
