/* * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ import com.oracle.java.testlibrary.JDKToolFinder; import com.oracle.java.testlibrary.OutputAnalyzer; import com.oracle.java.testlibrary.ProcessTools; import java.util.concurrent.TimeUnit; import java.util.concurrent.locks.Condition; import java.util.concurrent.locks.ReentrantLock; /* * @test * @summary * @library /testlibrary * @run main FinalizerInfoTest */ public class FinalizerInfoTest { static ReentrantLock lock = new ReentrantLock(); static volatile int wasInitialized = 0; static volatile int wasTrapped = 0; static final String cmd = "GC.finalizer_info"; static final int objectsCount = 1000; class MyObject { public MyObject() { // Make sure object allocation/deallocation is not optimized out wasInitialized += 1; } protected void finalize() { // Trap the object in a finalization queue wasTrapped += 1; lock.lock(); } } void run() throws Exception { try { lock.lock(); for(int i = 0; i < objectsCount; ++i) { new MyObject(); } System.out.println("Objects initialized: " + objectsCount); System.gc(); while(wasTrapped < 1) { // Waiting for gc thread. } String pid = Integer.toString(ProcessTools.getProcessId()); ProcessBuilder pb = new ProcessBuilder(); pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, cmd}); OutputAnalyzer output = new OutputAnalyzer(pb.start()); output.shouldContain("MyObject"); } finally { lock.unlock(); } } public static void main(String[] args) throws Exception { new FinalizerInfoTest().run(); } }