1 /*
   2  * Copyright (c) 2007, 2018, 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 
  24 /*
  25  * @test
  26  * @key stress gc
  27  *
  28  * @summary converted from VM Testbase gc/gctests/WeakReference/weak004.
  29  * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
  30  *
  31  * @library /vmTestbase
  32  *          /test/lib
  33  * @run driver jdk.test.lib.FileInstaller . .
  34  * @run main/othervm -XX:-UseGCOverheadLimit gc.gctests.WeakReference.weak004.weak004 -t 1
  35  */
  36 
  37 package gc.gctests.WeakReference.weak004;
  38 
  39 import nsk.share.gc.*;
  40 import java.lang.ref.WeakReference;
  41 
  42 /**
  43  * Test that GC correctly clears weak references.
  44  *
  45  * This test is the same as weak003 except that it creates
  46  * weak references to same object.
  47  */
  48 public class weak004 extends ThreadedGCTest {
  49 
  50     class Worker implements Runnable {
  51 
  52         private int arrayLength;
  53         private int objectSize = 100;
  54         private WeakReference[] references;
  55 
  56         private void makeReferences() {
  57             MemoryObject obj = new MemoryObject(objectSize);
  58             references = new WeakReference[arrayLength];
  59             for (int i = 0; i < arrayLength; ++i) {
  60                 references[i] = new WeakReference<MemoryObject>(obj);
  61             }
  62         }
  63 
  64         public void run() {
  65             arrayLength = Memory.getArrayLength(runParams.getTestMemory() - objectSize, Memory.getReferenceSize() + objectSize);
  66             System.out.println("Array size: " + arrayLength);
  67             makeReferences();
  68             Algorithms.eatMemory(getExecutionController());
  69             if (!getExecutionController().continueExecution()) {
  70                 return;
  71             }
  72             int n = 0;
  73             for (int i = 0; i < arrayLength; ++i) {
  74                 if (references[i].get() != null) {
  75                     ++n;
  76                 }
  77             }
  78             if (n != 0) {
  79                 log.error("Some of the references have been not cleared: " + n);
  80                 setFailed(true);
  81             }
  82         }
  83     }
  84 
  85     @Override
  86     protected Runnable createRunnable(int i) {
  87         return new Worker();
  88     }
  89 
  90     public static void main(String[] args) {
  91         GC.runTest(new weak004(), args);
  92     }
  93 }