1/*
2 * Copyright (C) 2016 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 */
16import java.util.IdentityHashMap;
17import dalvik.system.VMRuntime;
18
19public class Main {
20  public static void main(String[] args) {
21    System.loadLibrary(args[0]);
22    int initialSize = monitorListSize();
23    IdentityHashMap<Object, Integer> all = new IdentityHashMap();
24    for (int i = 0; i < 5000; ++i) {
25      Object obj = new Object();
26      synchronized(obj) {
27        // Should force inflation.
28        all.put(obj, obj.hashCode());
29      }
30    }
31    // Since monitor deflation is delayed significantly, we believe that even with an intervening
32    // GC, monitors should remain inflated.  We allow some slop for unrelated concurrent runtime
33    // actions.
34    int inflatedSize = monitorListSize();
35    if (inflatedSize >= initialSize + 4000) {
36        System.out.println("Monitor list grew by at least 4000 monitors");
37    } else {
38        System.out.println("Monitor list did not grow as expected");
39    }
40    // Encourage monitor deflation.
41    // trim() (Heap::Trim()) deflates only in JANK_IMPERCEPTIBLE state.
42    // Some of this mirrors code in ActivityThread.java.
43    final int DALVIK_PROCESS_STATE_JANK_PERCEPTIBLE = 0;
44    final int DALVIK_PROCESS_STATE_JANK_IMPERCEPTIBLE = 1;
45    VMRuntime.getRuntime().updateProcessState(DALVIK_PROCESS_STATE_JANK_IMPERCEPTIBLE);
46    System.gc();
47    System.runFinalization();
48    trim();
49    VMRuntime.getRuntime().updateProcessState(DALVIK_PROCESS_STATE_JANK_PERCEPTIBLE);
50    int finalSize = monitorListSize();
51    if (finalSize > initialSize + 1000) {
52        System.out.println("Monitor list failed to shrink properly");
53    } else {
54        System.out.println("Monitor list shrank correctly");
55    }
56    int j = 0;
57    for (Object obj: all.keySet()) {
58      ++j;
59      if (obj.hashCode() != all.get(obj)) {
60        throw new AssertionError("Failed hashcode test!");
61      }
62    }
63    System.out.println("Finished first check");
64    for (Object obj: all.keySet()) {
65      ++j;
66      synchronized(obj) {
67        if (obj.hashCode() != all.get(obj)) {
68          throw new AssertionError("Failed hashcode test!");
69        }
70      }
71    }
72    System.out.println("Finished second check");
73    System.out.println("Total checks: " + j);
74  }
75
76  private static native void trim();
77
78  private static native int monitorListSize();
79}
80