1 /* 2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import org.testng.annotations.Test; 25 import org.testng.Assert; 26 27 import java.util.concurrent.TimeUnit; 28 import java.util.concurrent.locks.Condition; 29 import java.util.concurrent.locks.ReentrantLock; 30 31 import jdk.test.lib.process.OutputAnalyzer; 32 import jdk.test.lib.dcmd.CommandExecutor; 33 import jdk.test.lib.dcmd.PidJcmdExecutor; 34 35 /* 36 * @test 37 * @summary 38 * @library /test/lib 39 * @modules java.base/jdk.internal.misc 40 * @modules java.xml 41 * java.management 42 * @run testng FinalizerInfoTest 43 */ 44 public class FinalizerInfoTest { 45 static ReentrantLock lock = new ReentrantLock(); 46 static volatile int wasInitialized = 0; 47 static volatile int wasTrapped = 0; 48 static final String cmd = "GC.finalizer_info"; 49 static final int objectsCount = 1000; 50 51 class MyObject { 52 public MyObject() { 53 // Make sure object allocation/deallocation is not optimized out 54 wasInitialized += 1; 55 } 56 57 protected void finalize() { 58 // Trap the object in a finalization queue 59 wasTrapped += 1; 60 lock.lock(); 61 } 62 } 63 64 public void run(CommandExecutor executor) { 65 try { 66 lock.lock(); 67 for(int i = 0; i < objectsCount; ++i) { 68 new MyObject(); 69 } 70 System.out.println("Objects initialized: " + objectsCount); 71 System.gc(); 72 73 while(wasTrapped < 1) { 74 // Waiting for gc thread. 75 } 76 77 OutputAnalyzer output = executor.execute(cmd); 78 output.shouldContain("MyObject"); 79 } finally { 80 lock.unlock(); 81 } 82 } 83 84 @Test 85 public void pid() { 86 run(new PidJcmdExecutor()); 87 } 88 }