JAVA中使用ReentrantLock时检测死锁_java reentrantlock 排查死锁

DeadlockChecker.java

static class DeadlockChecker {

    private final static ThreadMXBean mbean = ManagementFactory.getThreadMXBean();

    public static void check() {
        Thread tt = new Thread(() -> {
            while(true) {
                long[] deadlockedThreadIds = mbean.getAllThreadIds();
                if (deadlockedThreadIds != null) {
                    ThreadInfo[] threadInfos = mbean.getThreadInfo(deadlockedThreadIds);
                    for (Thread t : Thread.getAllStackTraces().keySet()) {
                        for (int i = 0; i < threadInfos.length; i++) {
                            if (t.getId() == threadInfos[i].getThreadId()) {
                                System.out.println(t.getName());
                                t.interrupt();
                            }
                        }
                    }
                }
                try {
                    Thread.sleep(5000);
                } catch (InterruptedException e) {}
            }
        });
        tt.setDaemon(true);
        tt.start();
    }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

举个栗子：

import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.util.concurrent.locks.ReentrantLock;

/**
 * <p> @Title LockInterrupt
 * <p> @Description 锁中断测试
 *
 * @author ACGkaka
 * @date 2020/12/8 14:46
 */
public class LockInterrupt extends Thread {

    public static ReentrantLock lock1 = new ReentrantLock();
    public static ReentrantLock lock2 = new ReentrantLock();

    int lock;

    public LockInterrupt(int lock, String name) {
        super(name);
        this.lock = lock;
    }

    @Override
    public void run() {
        try {
            if (lock == 1) {
                lock1.lockInterruptibly();
                try {
                    Thread.sleep(500);
                } catch (Exception e) {}
                lock2.lockInterruptibly();
            } else {
                lock2.lockInterruptibly();
                try {
                    Thread.sleep(500);
                } catch (Exception e) {}
                lock1.lockInterruptibly();
            }
        } catch (Exception e) {
        } finally {
            if (lock1.isHeldByCurrentThread()) {
                lock1.unlock();
            }
            if (lock2.isHeldByCurrentThread()) {
                lock2.unlock();
            }
            System.out.println(Thread.currentThread().getId() + ":线程退出");
        }
    }

    public static void main(String[] args) throws InterruptedException {
        LockInterrupt t1 = new LockInterrupt(1, "LockInterrupt1");
        LockInterrupt t2 = new LockInterrupt(2, "LockInterrupt2");
        t1.start();
        t2.start();
        Thread.sleep(1000);

        DeadlockChecker.check();
    }

    static class DeadlockChecker {

        private final static ThreadMXBean mbean = ManagementFactory.getThreadMXBean();

        public static void check() {
            Thread tt = new Thread(() -> {
                while(true) {
                    long[] deadlockedThreadIds = mbean.getAllThreadIds();
                    if (deadlockedThreadIds != null) {
                        ThreadInfo[] threadInfos = mbean.getThreadInfo(deadlockedThreadIds);
                        for (Thread t : Thread.getAllStackTraces().keySet()) {
                            for (int i = 0; i < threadInfos.length; i++) {
                                if (t.getId() == threadInfos[i].getThreadId()) {
                                    System.out.println(t.getName());
                                    t.interrupt();
                                }
                            }
                        }
                    }
                    try {
                        Thread.sleep(5000);
                    } catch (InterruptedException e) {}
                }
            });
            tt.setDaemon(true);
            tt.start();
        }
    }

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92