寫一個死鎖程序

時間 2019-12-08

標籤一個死鎖程序简体版

原文原文鏈接

序

死鎖在平時開發，尤爲是多併發編程時是要避免，不過要本身刻意寫個死鎖還不必定容易，下面參考別人代碼寫一個html

代碼編程

public class DeadLock implements Runnable{
    private int flag = 1;
    private static final Object o1 = new Object();
    private static final Object o2 = new Object();
    public void setFlag(int flag) {
        this.flag = flag;
    }

    @Override
    public void run() {
        if (flag == 1) {
            synchronized (o1) {
                System.out.println(Thread.currentThread().getName() + " o1");
                try {
                    Thread.sleep(800);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                synchronized (o2) {
                    System.out.println(Thread.currentThread().getName() + " o2");
                }
            }
        }
        if (flag == 2) {
            synchronized (o2) {
                System.out.println(Thread.currentThread().getName() + " o2");
                try {
                    Thread.sleep(800);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                synchronized (o1) {
                    System.out.println(Thread.currentThread().getName() + " o1");
                }
            }
        }
    }

    public static void main(String[] args) {
        DeadLock deadLock1 = new DeadLock();
        DeadLock deadLock2 = new DeadLock();

        deadLock1.setFlag(1);
        Thread thread1= new Thread(deadLock1, "Thread1");
        thread1.start();

        deadLock2.setFlag(2);
        Thread thread2= new Thread(deadLock2, "Thread2");
        thread2.start();
    }
}