132 lines
4.0 KiB
Java
132 lines
4.0 KiB
Java
/*
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* Copyright (c) 1998, 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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/* @test
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@bug 4026895
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@summary Ensure that System.runFinalization does not run finalizers in the
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thread that invokes it
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*/
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public class FinThreads {
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static Thread mainThread;
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static Object lock = new Object(); /* Protects following two fields */
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static Thread finalizerThread = null;
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static Thread finalizedBy = null;
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static class Foo {
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boolean catchFinalizer = false;
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/* Instances are only created in an auxiliary thread, in order to
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guard against stray references from the current thread's stack
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*/
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public static void create(final boolean catchFinalizer)
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throws InterruptedException
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{
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Thread t = new Thread(new Runnable() {
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public void run() {
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new Foo(catchFinalizer);
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}});
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t.start();
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t.join();
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}
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public Foo(boolean catchFinalizer) {
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this.catchFinalizer = catchFinalizer;
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}
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public void finalize() throws InterruptedException {
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if (catchFinalizer) {
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boolean gotFinalizer = false;
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synchronized (lock) {
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if (finalizerThread == null) {
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finalizerThread = Thread.currentThread();
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gotFinalizer = true;
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}
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}
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if (gotFinalizer) {
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System.err.println("Caught finalizer thread; sleeping...");
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Thread.sleep(Long.MAX_VALUE);
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}
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} else {
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synchronized (lock) {
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finalizedBy = Thread.currentThread();
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}
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System.err.println("Test object finalized by " + finalizedBy);
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}
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}
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}
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static void alarm(final Thread sleeper, final long delay)
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throws InterruptedException
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{
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Thread t = new Thread(new Runnable() {
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public void run() {
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try {
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Thread.sleep(delay);
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System.err.println("Waking " + sleeper);
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sleeper.interrupt();
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} catch (InterruptedException x) { }
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}});
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t.setDaemon(true);
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t.start();
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}
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public static void main(String[] args) throws Exception {
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mainThread = Thread.currentThread();
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/* Find the finalizer thread and put it to sleep */
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for (;;) {
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Foo.create(true);
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System.gc();
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synchronized (lock) {
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if (finalizerThread != null) break;
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}
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}
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/* Now create a finalizable object and run finalization */
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alarm(finalizerThread, 5000);
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Foo.create(false);
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for (;;) {
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System.gc();
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System.runFinalization();
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synchronized (lock) {
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if (finalizedBy != null) break;
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}
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}
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if (finalizedBy == mainThread)
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throw new Exception("Finalizer run in main thread");
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}
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}
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