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