150 lines
4.4 KiB
Java
150 lines
4.4 KiB
Java
/*
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* Copyright (c) 1997, 2012, 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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* @summary Basic functional test of reference objects
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* @author Mark Reinhold
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*/
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import java.lang.ref.*;
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import java.util.Vector;
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public class Basic {
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static ReferenceQueue q = new ReferenceQueue();
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static ReferenceQueue q2 = new ReferenceQueue();
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static Reference rw, rw2, rp, rp2;
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static Vector keep = new Vector();
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static boolean finalized = false;
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public static class ClearFinalizerThread {
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protected void finalize() {
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System.err.println("Cleared finalizer thread");
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}
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};
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protected void finalize() {
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Basic.finalized = true;
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System.err.println("Finalized " + this);
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}
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public static class Sub { };
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Object sub = new Sub();
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static void fork(Runnable proc) throws InterruptedException {
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Thread t = new Thread(proc);
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t.start();
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t.join();
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}
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static void showReferences() throws InterruptedException {
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fork(new Runnable() {
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public void run() {
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System.err.println("References: W " + rw.get()
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+ ", W2 " + rw2.get()
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+ ", P " + rp.get()
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+ ", P2 " + rp2.get());
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}
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});
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}
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static void createNoise() throws InterruptedException {
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fork(new Runnable() {
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public void run() {
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keep.addElement(new PhantomReference(new Object(), q2));
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}
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});
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}
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public static void main(String[] args) throws Exception {
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fork(new Runnable() {
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public void run() {
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Basic s = new Basic();
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rw = new WeakReference(s, q);
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rw2 = new WeakReference(s);
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rp = new PhantomReference(s, q);
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rp2 = new PhantomReference(s.sub, q);
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s = null;
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}
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});
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showReferences();
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int ndq = 0;
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boolean prevFinalized = false;
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outer:
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for (int i = 1;; i++) {
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Reference r;
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createNoise();
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System.err.println("GC " + i);
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Thread.sleep(10);
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System.gc();
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System.runFinalization();
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showReferences();
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while ((r = q2.poll()) != null) {
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System.err.println("Noise " + r);
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}
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/* Cause a dummy object to be finalized, since the finalizer thread
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might retain a reference to the Basic instance after it's been
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finalized (this happens with java_g) */
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if (Basic.finalized && !prevFinalized) {
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fork(new Runnable() {
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public void run() {
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new ClearFinalizerThread();
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}});
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prevFinalized = true;
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}
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while ((r = q.poll()) != null) {
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ndq++;
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if (r != null) {
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System.err.println("Dequeued " + r);
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if (ndq == 3) break outer;
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}
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}
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if (i >= 10) break;
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}
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if (ndq != 3) {
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throw new Exception("Expected to dequeue 3 reference objects,"
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+ " but only got " + ndq);
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}
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if (! Basic.finalized) {
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throw new Exception("Test object not finalized");
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}
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}
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}
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