java基础并发测试代码

2024-07-01 00:28:32 +08:00
parent da0e11337c
commit 30d826bb8e
23 changed files with 1258 additions and 25 deletions
@@ -0,0 +1,25 @@
+//package concurrent.thread;
+//
+//import org.openjdk.jol.info.ClassLayout;
+//
+///**
+// * @description: 锁升级 TODO
+// * @author: wangyl
+// * @date: 2024/6/21
+// */
+//public class SyncronizedLevelUp {
+//    public static void main(String[] args) throws InterruptedException {
+//        Object o = new Object();
+//        System.out.println("还没有进入到同步块");
+//        System.out.println("markword:" + ClassLayout.parseInstance(o).toPrintable());
+//        //默认JVM启动会有一个预热阶段，所以默认不会开启偏向锁
+//        Thread.sleep(5000);
+//        Object b = new Object();
+//        System.out.println("还没有进入到同步块");
+//        System.out.println("markword:" + ClassLayout.parseInstance(b).toPrintable());
+//        synchronized (o) {
+//            System.out.println("进入到了同步块");
+//            System.out.println("markword:" + ClassLayout.parseInstance(o).toPrintable());
+//        }
+//    }
+//}