JAVA經典題--死結案例

標籤：bsp   []   lag   zed   tst   thread   read   catch   std   

死結原理: 兩個線程相互等待對方釋放同步監視器

例子程式:

 1 public class TestDeadLock implements Runnable { 2      3     public int flag = 1; 4     static Object o1 = new Object(), o2 = new Object(); 5  6     public void run() { 7         if (flag == 1) { 8             synchronized (o1) { 9                 try {10                     Thread.sleep(500);11                 } catch (Exception e) {12                     e.printStackTrace();13                 }14                 synchronized (o2) {15                     System.out.println("1");16                 }17             }18         }19         if (flag == 0) {20             synchronized (o2) {21                 try {22                     Thread.sleep(500);23                 } catch (Exception e) {24                     e.printStackTrace();25                 }26                 synchronized (o1) {27                     System.out.println("0");28                 }29             }30         }31     }32     33     public static void main(String[] args) {34         TestDeadLock td1 = new TestDeadLock();35         TestDeadLock td2 = new TestDeadLock();36         td1.flag = 1;37         td2.flag = 0;38         Thread t1 = new Thread(td1);39         Thread t2 = new Thread(td2);40         t1.start();41         t2.start();42     }43 }

 

JAVA經典題--死結案例