/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
public class Main {
public static void main(String[] args) {
Object o = new Object();
// Generate a hashcode and put it in the lock word.
int hashOrig = o.hashCode();
int hashInflated = 0;
int hashSystemOrig = System.identityHashCode(o);
int hashSystemInflated = 0;
// Inflate the monitor to move the hash from the lock word to the Monitor.
synchronized (o) {
hashInflated = o.hashCode();
hashSystemInflated = System.identityHashCode(o);
}
// Make sure that all the hashes agree.
if (hashOrig != hashInflated || hashOrig != hashSystemOrig ||
hashSystemOrig != hashSystemInflated) {
System.err.println("hash codes dont match: " + hashOrig + " " + hashInflated + " " +
hashSystemOrig + " " + hashSystemInflated);
}
System.out.println("Done.");
}
}