1 /* 2 3 * Copyright (C) 2016 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 import java.lang.reflect.Method; 19 import java.util.Map; 20 21 public class Main implements Runnable { 22 static final int numberOfThreads = 4; 23 static final int totalOperations = 1000; 24 static Method enableAllocTrackingMethod; 25 static Object holder; 26 static volatile boolean trackingThreadDone = false; 27 int threadIndex; 28 Main(int index)29 Main(int index) { 30 threadIndex = index; 31 } 32 main(String[] args)33 public static void main(String[] args) throws Exception { 34 Class klass = Class.forName("org.apache.harmony.dalvik.ddmc.DdmVmInternal"); 35 if (klass == null) { 36 throw new AssertionError("Couldn't find DdmVmInternal class"); 37 } 38 enableAllocTrackingMethod = klass.getDeclaredMethod("enableRecentAllocations", 39 Boolean.TYPE); 40 if (enableAllocTrackingMethod == null) { 41 throw new AssertionError("Couldn't find enableRecentAllocations method"); 42 } 43 44 final Thread[] threads = new Thread[numberOfThreads]; 45 for (int t = 0; t < threads.length; t++) { 46 threads[t] = new Thread(new Main(t)); 47 threads[t].start(); 48 } 49 for (Thread t : threads) { 50 t.join(); 51 } 52 System.out.println("Finishing"); 53 } 54 run()55 public void run() { 56 if (threadIndex == 0) { 57 for (int i = 0; i < totalOperations; ++i) { 58 try { 59 enableAllocTrackingMethod.invoke(null, true); 60 holder = new Object(); 61 enableAllocTrackingMethod.invoke(null, false); 62 } catch (Exception e) { 63 System.out.println(e); 64 return; 65 } 66 } 67 trackingThreadDone = true; 68 } else { 69 while (!trackingThreadDone) { 70 holder = new Object(); 71 } 72 } 73 } 74 } 75