Java死锁检测

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ThreadMXBean

常用方法:

  /** ThreadMXBean常用方法test */        ThreadMXBean threadMXBean= ManagementFactory.getThreadMXBean();        int count=threadMXBean.getThreadCount();//获取当前线程数目        System.out.println("当前线程数为："+count);        long[]  threadIds=threadMXBean.getAllThreadIds();        System.out.println("当前线程id们为："+ JSONObject.toJSONString(threadIds));        ThreadInfo[] threadInfos=threadMXBean.getThreadInfo(threadMXBean.getAllThreadIds());        System.out.println("当前线程的信息："+JSONObject.toJSONString(threadInfos));        System.out.println("是否支持测量线程执行时间："+threadMXBean.isCurrentThreadCpuTimeSupported());

/** * 死锁检测工具 * Created by liuhuichao on 2017/6/21. */public class DeadLockCheckChecker {    private  final static ThreadMXBean mbean=ManagementFactory.getThreadMXBean();    final static Runnable deadLockCheck=new Runnable() {        @Override        public void run() {            while (true){                long[] deadLockedThreadIds=mbean.findDeadlockedThreads();                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()){                                t.interrupt();                            }                        }                    }                }                try {                    Thread.sleep(1000);                } catch (InterruptedException e) {                }            }        }    };    public static void check(){        Thread thread=new Thread(deadLockCheck);        thread.setDaemon(true);        thread.start();    }}

可中断性测试:

/**ReentrantLock可中断性测试 * Created by liuhuichao on 2017/6/20. */public class ReentrantLockInterruptedTest implements Runnable {    public static ReentrantLock lock1=new ReentrantLock();    public static ReentrantLock lock2=new ReentrantLock();    int lock;    /**     * 控制加锁顺序，方便构造死锁     * @param lock     */    public ReentrantLockInterruptedTest(int lock) {        this.lock = lock;    }    @Override    public void run() {        try{            if(lock==1){                lock1.lockInterruptibly();                try{                    Thread.sleep(500);                }catch (InterruptedException e){}                lock2.lockInterruptibly();            }else{                lock2.lockInterruptibly();                try{                    Thread.sleep(500);                }catch (InterruptedException e){}                lock1.lockInterruptibly();            }        } catch (InterruptedException e) {            e.printStackTrace();        }finally {            if(lock1.isHeldByCurrentThread()){                lock1.unlock();            }            if(lock2.isHeldByCurrentThread()){                lock2.unlock();            }            System.out.println("线程退出："+Thread.currentThread().getId());        }    }    public static void main(String[] args)  throws Exception{        ReentrantLockInterruptedTest l1=new ReentrantLockInterruptedTest(1);        ReentrantLockInterruptedTest l2=new ReentrantLockInterruptedTest(2);        Thread t1=new Thread(l1);        Thread t2=new Thread(l2);        t1.start();        t2.start();        Thread.sleep(1000);       DeadLockCheckChecker.check();    }}

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