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/weak003.
  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.weak003.weak003 -t 1
  35  */
  36 
  37 package gc.gctests.WeakReference.weak003;
  38 
  39 import java.lang.ref.Reference;
  40 import nsk.share.test.*;
  41 import nsk.share.TestFailure;
  42 import nsk.share.gc.*;
  43 import java.lang.ref.WeakReference;
  44 
  45 /**
  46  * Test that GC clears weak references before throwing OOM.
  47  *
  48  * This test creates a number of weak references, then provokes
  49  * GC with Algorithms.eatMemory and checks that all references
  50  * have been cleared.
  51  *
  52  * This assertion is not clearly stated in javadoc for WeakReference,
  53  * (but for SoftReference), but one would expect that quality GC
  54  *  will do it.
  55  */
  56 public class weak003 extends ThreadedGCTest {
  57 
  58     class Worker implements Runnable {
  59 
  60         private int arrayLength;
  61         private int objectSize = 100;
  62         private Reference<MemoryObject>[] references;
  63 
  64         public void run() {
  65             for (int i = 0; i < arrayLength; ++i) {
  66                 references[i] = new WeakReference<MemoryObject>(new MemoryObject(LocalRandom.nextInt(objectSize)));
  67             }
  68             Algorithms.eatMemory(getExecutionController());
  69             if (!getExecutionController().continueExecution()) {
  70                 return;
  71             }
  72             // Check that all references have been cleared
  73             int n = 0;
  74             for (int i = 0; i < arrayLength; ++i) {
  75                 if (references[i].get() != null) {
  76                     ++n;
  77                 }
  78             }
  79             if (n != 0) {
  80                 references = null;
  81                 throw new TestFailure("Some of the references have been not cleared: " + n);
  82             }
  83         }
  84 
  85         public void Worker() {
  86             arrayLength = Memory.getArrayLength(runParams.getTestMemory(), Memory.getReferenceSize() + objectSize);
  87             System.out.println("Array size: " + arrayLength);
  88             references = new WeakReference[arrayLength];
  89         }
  90     }
  91 
  92     @Override
  93     protected Runnable createRunnable(int i) {
  94         return new Worker();
  95     }
  96 
  97     public static void main(String[] args) {
  98         GC.runTest(new weak003(), args);
  99     }
 100 }