126 lines
4.7 KiB
Java
126 lines
4.7 KiB
Java
/*
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* Copyright (c) 2015, 2023, 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 java.util.concurrent.CountDownLatch;
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import jdk.test.lib.dcmd.CommandExecutor;
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import jdk.test.lib.dcmd.JMXExecutor;
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public class FinalizationRunner {
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public static final String FAILED = "Failed";
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public static final String PASSED = "Passed";
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static volatile boolean wasFinalized = false;
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private static final CountDownLatch finRunLatch = new CountDownLatch(1);
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private static final CountDownLatch finBlockLatch = new CountDownLatch(1);
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static class MyObject {
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@Override
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@SuppressWarnings("removal")
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protected void finalize() {
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if (Thread.currentThread().getName().equals("Finalizer")) {
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try {
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System.out.println("inside the regular finalizer thread; blocking");
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// 'regular' finalizer thread is ready to be effectively blocked -
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// we can continue with the GC.run_finalization test
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finRunLatch.countDown();
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// prevent the 'regular' finalizer from finalizing this instance
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// until the GC.run_finalization has had its chance to do so
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finBlockLatch.await();
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} catch (InterruptedException e) {
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}
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} else {
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if (Thread.currentThread().getName().equals("Secondary finalizer")) {
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System.out.println("finalizing the test instance");
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// finalizing on behalf of GC.run_finalization -
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// unblock the 'regular' finalizer and the test main method
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wasFinalized = true;
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} else {
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fail("Unexpected finalizer thread name: " +
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Thread.currentThread().getName());
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}
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finBlockLatch.countDown();
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}
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}
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}
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// this instance will be used to provoke the regular finalization
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// so the finalizer thread can be blocked for the duration of
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// GC.run_finalization test
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public static MyObject o1;
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// this instance will be used to perform the GC.run_finalization test
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public static MyObject o2;
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private static void run(CommandExecutor executor) {
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o2 = new MyObject();
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o2 = null;
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System.out.println("running GC.run_finalization");
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System.gc();
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executor.execute("GC.run_finalization");
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System.out.println("Waiting for finalization");
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try {
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finBlockLatch.await();
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if (wasFinalized) {
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System.out.println(PASSED + ": Object was finalized");
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} else {
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fail("Object was not finalized");
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}
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} catch (InterruptedException e) {
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fail("Interrupted while waiting for finalization", e);
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}
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}
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public static void main(String ... args) {
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System.out.println("\n=== FinalizationRunner");
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try {
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blockFinalizerThread();
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Runtime.getRuntime().addShutdownHook(new Thread(()->{
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run(new JMXExecutor());
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}));
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} catch (InterruptedException e) {
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fail("Interrupted while trying to block the finalizer thread", e);
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}
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}
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private static void blockFinalizerThread() throws InterruptedException {
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System.out.println("trying to block the finalizer thread");
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o1 = new MyObject();
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o1 = null;
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System.gc();
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finRunLatch.await();
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}
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private static void fail(String msg, Exception e) {
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fail(msg);
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e.printStackTrace(System.err);
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}
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private static void fail(String msg) {
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System.err.println(FAILED + ": " + msg);
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}
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}
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