e9207384c5
4268317: (ref) Reference.isEnqueued() can return true when instance not enqueued The reference handler now declares, and assumes, that the discovered field, rather than the next field, is (to be) used to link the entries in the pending list, thus allowing a reference object to be safely enqueued even while it is in the pending state. Also added slightly modified regression tests from the two bug reports. Reviewed-by: mchung, alanb, jcoomes
80 lines
2.7 KiB
Java
80 lines
2.7 KiB
Java
/*
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* Copyright (c) 2011, 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 4268317
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* @summary Test if Reference.enqueue() works properly with GC
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*/
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import java.lang.ref.*;
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public class ReferenceEnqueue {
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public static void main(String args[]) throws Exception {
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for (int i=0; i < 5; i++)
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new WeakRef().run();
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System.out.println("Test passed.");
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}
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static class WeakRef {
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final ReferenceQueue<Object> queue = new ReferenceQueue<Object>();
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final Reference<Object> ref;
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final int iterations = 1000;
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WeakRef() {
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this.ref = new WeakReference<Object>(new Object(), queue);
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}
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void run() throws InterruptedException {
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System.gc();
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for (int i = 0; i < iterations; i++) {
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System.gc();
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if (ref.isEnqueued()) {
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break;
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}
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Thread.sleep(100);
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}
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if (ref.isEnqueued() == false) {
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// GC have not enqueued refWeak for the timeout period
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System.out.println("Reference not enqueued yet");
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return;
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}
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if (ref.enqueue() == true) {
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// enqueue() should return false since
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// ref is already enqueued by the GC
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throw new RuntimeException("Error: enqueue() returned true;"
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+ " expected false");
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}
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if (queue.poll() == null) {
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// poll() should return ref enqueued by the GC
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throw new RuntimeException("Error: poll() returned null;"
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+ " expected ref object");
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}
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}
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}
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}
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