1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 public class Main { 18 public static void main(String[] args) { 19 Object o = new Object(); 20 // Generate a hashcode and put it in the lock word. 21 int hashOrig = o.hashCode(); 22 int hashInflated = 0; 23 int hashSystemOrig = System.identityHashCode(o); 24 int hashSystemInflated = 0; 25 // Inflate the monitor to move the hash from the lock word to the Monitor. 26 synchronized (o) { 27 hashInflated = o.hashCode(); 28 hashSystemInflated = System.identityHashCode(o); 29 } 30 // Make sure that all the hashes agree. 31 if (hashOrig != hashInflated || hashOrig != hashSystemOrig || 32 hashSystemOrig != hashSystemInflated) { 33 System.err.println("hash codes dont match: " + hashOrig + " " + hashInflated + " " + 34 hashSystemOrig + " " + hashSystemInflated); 35 } 36 System.out.println("Done."); 37 } 38 } 39 40 41
