88 lines
3.0 KiB
Java
88 lines
3.0 KiB
Java
/*
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* Copyright (c) 2012, 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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/*
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* @test
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* @bug 7190310
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* @summary Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops
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*
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* @run main/othervm/timeout=600 -Xbatch compiler.c2.Test7190310
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*/
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/*
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* Note bug exhibits as infinite loop, timeout is helpful.
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* It should normally finish pretty quickly, but on some especially slow machines
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* it may not. The companion _unsafe test lacks a timeout, but that is okay.
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*/
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package compiler.c2;
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import java.lang.ref.Reference;
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import java.lang.ref.ReferenceQueue;
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import java.lang.ref.WeakReference;
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import java.lang.ref.Cleaner;
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public class Test7190310 {
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private static Object str = new Object() {
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public String toString() {
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return "The Object";
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}
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};
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private final static ReferenceQueue<Object> rq =
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new ReferenceQueue<Object>();
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private final static WeakReference<Object> wr =
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new WeakReference<Object>(str, rq);
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public static void main(String[] args)
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throws InterruptedException {
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Cleaner.create().register(str, () -> System.out.println("The Object is being finalized"));
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Thread reader = new Thread() {
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public void run() {
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while (wr.get() != null) {
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}
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System.out.println("wr.get() returned null");
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}
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};
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Thread queueReader = new Thread() {
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public void run() {
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try {
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Reference<? extends Object> ref = rq.remove();
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System.out.println(ref);
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System.out.println("queueReader returned, ref==wr is "
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+ (ref == wr));
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} catch (InterruptedException e) {
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System.err.println("Sleep interrupted - exiting");
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}
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}
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};
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reader.start();
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queueReader.start();
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Thread.sleep(1000);
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str = null;
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System.gc();
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}
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}
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