写一个synchronized死锁
时间: 2023-12-15 08:00:35 浏览: 33
要写一个产生synchronized死锁的示例,可以创建两个线程,并在每个线程的代码块中嵌套调用两个共享的锁对象。这样,当一个线程持有一个锁并尝试获取另一个锁时,而另一个线程正好相反,就会发生死锁。例如:
```
public class DeadlockExample {
private static final Object lock1 = new Object();
private static final Object lock2 = new Object();
public static void main(String[] args) {
Thread thread1 = new Thread(() -> {
synchronized (lock1) {
System.out.println("Thread 1 acquired lock1");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
synchronized (lock2) {
System.out.println("Thread 1 acquired lock2");
}
}
});
Thread thread2 = new Thread(() -> {
synchronized (lock2) {
System.out.println("Thread 2 acquired lock2");
synchronized (lock1) {
System.out.println("Thread 2 acquired lock1");
}
}
});
thread1.start();
thread2.start();
}
}
```
在这个示例中,Thread 1首先获取lock1,然后尝试获取lock2。同时,Thread 2首先获取lock2,然后尝试获取lock1。由于两个线程都在相互等待对方释放锁,因此它们陷入了死锁状态。这是因为两个线程都无法继续执行,直到它们都能同时获取所需的锁。
这个死锁示例说明了在使用synchronized关键字时,如果没有正确处理锁的顺序和释放,就容易发生死锁情况。为避免死锁,可以在设计多线程应用程序时考虑锁的顺序和使用锁的范围,以及避免嵌套使用锁对象。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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