jdk8-mips64-public/hotspot: test/compiler/7190310/Test7190310.java@2bac854670c0

     1 /*

     2  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 /*

    26  * @test

    27  * @bug 7190310

    28  * @summary Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops

    29  * @run main/othervm/timeout=600 -Xbatch Test7190310

    30  */

    32 /*

    33  * Note bug exhibits as infinite loop, timeout is helpful.

    34  * It should normally finish pretty quickly, but on some especially slow machines

    35  * it may not.  The companion _unsafe test lacks a timeout, but that is okay.

    36  */

    38 import java.lang.ref.*;

    40 public class Test7190310 {

    41   private static Object str = new Object() {

    42     public String toString() {

    43       return "The Object";

    44     }

    46     protected void finalize() throws Throwable {

    47       System.out.println("The Object is being finalized");

    48       super.finalize();

    49     }

    50   };

    51   private final static ReferenceQueue<Object> rq =

    52       new ReferenceQueue<Object>();

    53   private final static WeakReference<Object> wr =

    54       new WeakReference<Object>(str, rq);

    56   public static void main(String[] args)

    57       throws InterruptedException {

    58     Thread reader = new Thread() {

    59       public void run() {

    60         while (wr.get() != null) {

    61         }

    62         System.out.println("wr.get() returned null");

    63       }

    64     };

    66     Thread queueReader = new Thread() {

    67       public void run() {

    68         try {

    69           Reference<? extends Object> ref = rq.remove();

    70           System.out.println(ref);

    71           System.out.println("queueReader returned, ref==wr is "

    72               + (ref == wr));

    73         } catch (InterruptedException e) {

    74           System.err.println("Sleep interrupted - exiting");

    75         }

    76       }

    77     };

    79     reader.start();

    80     queueReader.start();

    82     Thread.sleep(1000);

    83     str = null;

    84     System.gc();

    85   }

    86 }

Mercurial > jdk8-mips64-public > hotspot / file revision