Main.java revision d5b11363bd5f89a9000b8b3ce449dcd7b901c3b2 
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
17public 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
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