死锁定位与解决方案

深藏阁楼爱情的钟 2022-10-24 01:35 230阅读 0赞

## 1.源码如下 ##

package cn.haochen.locak;
    
    /**
     * @author haochen
     * desc:死锁模拟程序
     */
    public class DeadLockDemo { 
        public static void main(String[] args) { 
            DeadLock d1=new DeadLock(true);
            DeadLock d2=new DeadLock(false);
            Thread t1=new Thread(d1);
            Thread t2=new Thread(d2);
            t1.start();
            t2.start();
        }
    }
    
    /**
     * 定义锁对象
     */
    class MyLock{ 
    
        public static Object obj1=new Object();
    
        public static Object obj2=new Object();
    
    }
    
    /**
     * 死锁代码
     */
    class DeadLock implements Runnable { 
        private boolean flag;
    
        DeadLock(boolean flag) { 
            this.flag = flag;
        }
    
        @Override
        public void run() { 
            if (flag) { 
                while (true) { 
                    synchronized (MyLock.obj1) { 
                        System.out.println(Thread.currentThread().getName() + "if获得obj1锁");
                        synchronized (MyLock.obj2) { 
                            System.out.println(Thread.currentThread().getName() + "if获得obj2锁");
                        }
                    }
    
                }
            } else { 
                while (true) { 
                    synchronized (MyLock.obj2) { 
                        System.out.println(Thread.currentThread().getName() + "否则获得obj1锁");
                        synchronized (MyLock.obj1) { 
                            System.out.println(Thread.currentThread().getName() + "否则获得obj2锁");
                        }
                    }
    
                }
    
            }
        }
    }

## 2.运行结果如下 ##

![在这里插入图片描述][20210128175921139.png]

## 3.监测结果如下 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L09ubHlvbmVGcmlzdA_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L09ubHlvbmVGcmlzdA_size_16_color_FFFFFF_t_70 1]

## 4.解决方案 ##

更改下锁资源的顺序  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L09ubHlvbmVGcmlzdA_size_16_color_FFFFFF_t_70 2]

## 5.结果如下 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L09ubHlvbmVGcmlzdA_size_16_color_FFFFFF_t_70 3]

[20210128175921139.png]: /images/20221024/ea8a4a548a6740b5ae9315d0345cca24.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L09ubHlvbmVGcmlzdA_size_16_color_FFFFFF_t_70]: /images/20221024/4f6a59156a2340eeb5072ebc66febeff.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L09ubHlvbmVGcmlzdA_size_16_color_FFFFFF_t_70 1]: /images/20221024/6a22155545d6499fbb2a08939ae3c237.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L09ubHlvbmVGcmlzdA_size_16_color_FFFFFF_t_70 2]: /images/20221024/98692dcd2214473aa6aee22be1839c75.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L09ubHlvbmVGcmlzdA_size_16_color_FFFFFF_t_70 3]: /images/20221024/927fff83f07245cf93f2b126a93e3b24.png