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 randomness 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 }