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/weak005. 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.weak005.weak005 -t 1 35 */ 36 37 package gc.gctests.WeakReference.weak005; 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 creates a number of weak references, 46 * each of which points to the next, then provokes 47 * GC with Algorithms.eatMemory(). The test succeeds 48 * if last reference has been cleared. 49 */ 50 public class weak005 extends ThreadedGCTest { 51 52 class Worker implements Runnable { 53 54 private int length = 10000; 55 private int objectSize = 10000; 56 private WeakReference[] references; 57 58 public Worker() { 59 System.out.println("Array size: " + length); 60 System.out.println("Object size: " + objectSize); 61 references = new WeakReference[length]; 62 } 63 64 private void makeReferences() { 65 references[length - 1] = null; 66 MemoryObject obj = new MemoryObject(objectSize); 67 references[0] = new WeakReference(obj); 68 for (int i = 1; i < length; ++i) { 69 references[i] = new WeakReference(references[i - 1]); 70 } 71 for (int i = 0; i < length - 1; ++i) { 72 references[i] = null; 73 } 74 } 75 76 public void run() { 77 makeReferences(); 78 Algorithms.eatMemory(getExecutionController()); 79 if (!getExecutionController().continueExecution()) { 80 return; 81 } 82 if (references[length - 1].get() != null) { 83 log.error("Last weak reference has not been cleared"); 84 setFailed(true); 85 } 86 } 87 } 88 89 @Override 90 protected Runnable createRunnable(int i) { 91 return new Worker(); 92 } 93 94 public static void main(String[] args) { 95 GC.runTest(new weak005(), args); 96 } 97 }