/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import java.util.IdentityHashMap;
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import dalvik.system.VMRuntime;
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public class Main {
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public static void main(String[] args) {
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System.loadLibrary(args[0]);
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int initialSize = monitorListSize();
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IdentityHashMap<Object, Integer> all = new IdentityHashMap();
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for (int i = 0; i < 5000; ++i) {
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Object obj = new Object();
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synchronized(obj) {
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// Should force inflation.
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all.put(obj, obj.hashCode());
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}
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}
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// Since monitor deflation is delayed significantly, we believe that even with an intervening
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// GC, monitors should remain inflated. We allow some slop for unrelated concurrent runtime
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// actions.
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int inflatedSize = monitorListSize();
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if (inflatedSize >= initialSize + 4000) {
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System.out.println("Monitor list grew by at least 4000 monitors");
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} else {
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System.out.println("Monitor list did not grow as expected");
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}
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// Encourage monitor deflation.
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// trim() (Heap::Trim()) deflates only in JANK_IMPERCEPTIBLE state.
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// Some of this mirrors code in ActivityThread.java.
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final int DALVIK_PROCESS_STATE_JANK_PERCEPTIBLE = 0;
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final int DALVIK_PROCESS_STATE_JANK_IMPERCEPTIBLE = 1;
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VMRuntime.getRuntime().updateProcessState(DALVIK_PROCESS_STATE_JANK_IMPERCEPTIBLE);
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System.gc();
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System.runFinalization();
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trim();
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VMRuntime.getRuntime().updateProcessState(DALVIK_PROCESS_STATE_JANK_PERCEPTIBLE);
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int finalSize = monitorListSize();
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if (finalSize > initialSize + 1000) {
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System.out.println("Monitor list failed to shrink properly");
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} else {
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System.out.println("Monitor list shrank correctly");
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}
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int j = 0;
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for (Object obj: all.keySet()) {
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++j;
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if (obj.hashCode() != all.get(obj)) {
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throw new AssertionError("Failed hashcode test!");
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}
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}
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System.out.println("Finished first check");
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for (Object obj: all.keySet()) {
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++j;
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synchronized(obj) {
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if (obj.hashCode() != all.get(obj)) {
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throw new AssertionError("Failed hashcode test!");
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}
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}
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}
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System.out.println("Finished second check");
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System.out.println("Total checks: " + j);
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}
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private static native void trim();
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private static native int monitorListSize();
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}
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