死锁

liuxun · liuxun · commit 8d4314b6a753 · 2018-02-05T10:58:20.000+08:00
diff --git a/src/main/java/com/algorithm/study/demo/thread/DeadlockTest.java b/src/main/java/com/algorithm/study/demo/thread/DeadlockTest.java
@@ -0,0 +1,51 @@
+package com.algorithm.study.demo.thread;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * 死锁案例
+ *
+ * 避免死锁：一种是加锁顺序（线程按照一定的顺序加锁）；另一种是加锁时限（线程尝试获取锁的时候加上一定的时限，超过时限则放弃对该锁的请求，并释放自己占有的锁）；
+ */
+public class DeadlockTest {
+    private static Object o1=new Object();
+    private static Object o2=new Object();
+    public static void main(String[] args) {
+          new Thread(){
+              @Override
+              public void run() {
+                  synchronized (o1){
+                      System.out.println("Thread1 get lock o1");
+                      try {
+                          TimeUnit.SECONDS.sleep(1);
+                      } catch (InterruptedException e) {
+                          e.printStackTrace();
+                      }
+                      synchronized (o2){
+                          System.out.println("Thread1 get lock o2");
+                      }
+                      System.out.println("Thread1 end");
+                  }
+              }
+          }.start();
+
+
+        new Thread(){
+            @Override
+            public void run() {
+                synchronized (o2){
+                    System.out.println("Thread2 get lock o1");
+                    try {
+                        TimeUnit.SECONDS.sleep(1);
+                    } catch (InterruptedException e) {
+                        e.printStackTrace();
+                    }
+                    synchronized (o1){
+                        System.out.println("Thread2 get lock o2");
+                    }
+                    System.out.println("Thread2 end");
+                }
+            }
+        }.start();
+    }
+}
