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/weak007. 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.weak007.weak007 -t 1 35 */ 36 37 package gc.gctests.WeakReference.weak007; 38 39 import nsk.share.TestFailure; 40 import nsk.share.gc.*; 41 import java.lang.ref.WeakReference; 42 import java.lang.ref.Reference; 43 44 /** 45 * Test that GC correctly clears weak references. 46 * 47 * This test creates a number of weak references, 48 * each of which points to the next, then provokes 49 * GC with Algorithms.eatMemory(). The test succeeds 50 * if last reference has been cleared and the object 51 * has been finalized. 52 */ 53 public class weak007 extends ThreadedGCTest { 54 55 class Worker implements Runnable { 56 57 private int length = 10000; 58 private int objectSize = 10000; 59 private Reference[] references; 60 61 private void makeReferences() { 62 references[length - 1] = null; 63 FinMemoryObject obj = new FinMemoryObject(objectSize); 64 references[0] = new WeakReference(obj); 65 for (int i = 1; i < length; ++i) { 66 references[i] = new WeakReference(references[i - 1]); 67 } 68 for (int i = 0; i < length - 1; ++i) { 69 references[i] = null; 70 } 71 } 72 73 public void run() { 74 makeReferences(); 75 Algorithms.eatMemory(getExecutionController()); 76 if (getExecutionController().continueExecution()) { 77 if (references[length - 1].get() != null) { 78 throw new TestFailure("Last weak reference has not been cleared"); 79 } 80 } else { 81 log.info("Completed iterations: " + getExecutionController().getIteration()); 82 } 83 } 84 85 public Worker() { 86 log.info("Array size: " + length); 87 log.info("Object size: " + objectSize); 88 references = new WeakReference[length]; 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 weak007(), args); 99 } 100 }