Java多线程并发问题：死锁案例-蒲公英云

Java多线程并发问题：死锁案例

原创水深无声 2024-10-16 18:48 150阅读 0赞

死锁是多线程编程中的一种严重问题，它发生在两个或更多的线程互相等待对方释放资源时。

以下是一个经典的死锁案例：

// 线程1（主）：
class Thread1 extends Thread {
    Object resource1 = new Object();
    Object resource2 = new Object();
    public void run() {
        try {
            acquireResource(resource1);
            acquireResource(resource2);
            // 主线程执行完操作后释放资源
            releaseResource(resource1);
            releaseResource(resource2);
        } catch (InterruptedException | RuntimeException e) {
            System.out.println("Thread 1: Error " + e.getMessage());
            e.printStackTrace();
        }
    }
    // 获取资源方法
    private synchronized void acquireResource(Object resource) {
        while (!resourceLocks.contains(resource)) {
            try {
                // 线程等待资源可用
                lock资源共享资源(resource);
                resourceLocks.add(resource);
                System.out.println("Thread 1: Resource " + resource + " acquired");
            } catch (InterruptedException | RuntimeException e) {
                System.out.println("Thread 1: Error " + e.getMessage());
                e.printStackTrace();
                unlockResource(resource);
            }
        }
    }
    // 释放资源方法
    private synchronized void releaseResource(Object resource) {
        if (resourceLocks.contains(resource)) {
            resourceLocks.remove(resource);
            try {
                // 线程解锁，资源返回可用状态
                unlockResource(resource);
                System.out.println("Thread 1: Resource " + resource + " released");
            } catch (InterruptedException | RuntimeException e) {
                System.out.println("Thread 1: Error " + e.getMessage());
                e.printStackTrace();
            }
        }
    }
    public static void main(String[] args) {
        Thread1 thread1 = new Thread1();
        thread1.start();
    }
}