| /* |
| * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @key stress gc |
| * |
| * @summary converted from VM Testbase gc/gctests/WeakReference/weak005. |
| * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent] |
| * |
| * @library /vmTestbase |
| * /test/lib |
| * @run driver jdk.test.lib.FileInstaller . . |
| * @run main/othervm -XX:-UseGCOverheadLimit gc.gctests.WeakReference.weak005.weak005 -t 1 |
| */ |
| |
| package gc.gctests.WeakReference.weak005; |
| |
| import nsk.share.gc.*; |
| import java.lang.ref.WeakReference; |
| |
| /** |
| * Test that GC correctly clears weak references. |
| * |
| * This test creates a number of weak references, |
| * each of which points to the next, then provokes |
| * GC with Algorithms.eatMemory(). The test succeeds |
| * if last reference has been cleared. |
| */ |
| public class weak005 extends ThreadedGCTest { |
| |
| class Worker implements Runnable { |
| |
| private int length = 10000; |
| private int objectSize = 10000; |
| private WeakReference[] references; |
| |
| public Worker() { |
| System.out.println("Array size: " + length); |
| System.out.println("Object size: " + objectSize); |
| references = new WeakReference[length]; |
| } |
| |
| private void makeReferences() { |
| references[length - 1] = null; |
| MemoryObject obj = new MemoryObject(objectSize); |
| references[0] = new WeakReference(obj); |
| for (int i = 1; i < length; ++i) { |
| references[i] = new WeakReference(references[i - 1]); |
| } |
| for (int i = 0; i < length - 1; ++i) { |
| references[i] = null; |
| } |
| } |
| |
| public void run() { |
| makeReferences(); |
| Algorithms.eatMemory(getExecutionController()); |
| if (!getExecutionController().continueExecution()) { |
| return; |
| } |
| if (references[length - 1].get() != null) { |
| log.error("Last weak reference has not been cleared"); |
| setFailed(true); |
| } |
| } |
| } |
| |
| @Override |
| protected Runnable createRunnable(int i) { |
| return new Worker(); |
| } |
| |
| public static void main(String[] args) { |
| GC.runTest(new weak005(), args); |
| } |
| } |