| /* |
| * Copyright (c) 1997, 1998, 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 |
| * @bug 4076283 |
| * @summary java.lang.ref.SoftReference should reliably prevent |
| * OutOfMemoryErrors |
| * @author Peter Jones |
| * @author Mark Reinhold |
| */ |
| |
| /* If this test fails, an OutOfMemoryError will be thrown */ |
| |
| import java.lang.ref.SoftReference; |
| |
| |
| public class Bash { |
| |
| static class TestReference extends SoftReference { |
| |
| public static TestReference head; |
| public TestReference next; |
| |
| public TestReference(Object referent) { |
| super(referent); |
| next = head; |
| head = this; |
| } |
| } |
| |
| |
| static final int NUM_BLOCKS = 2048; |
| static final int BLOCK_SIZE = 32768; |
| |
| |
| public static void main(String[] args) throws Exception { |
| |
| for (int i = 0; i < NUM_BLOCKS; ++ i) { |
| TestReference ref = new TestReference(new byte[BLOCK_SIZE]); |
| } |
| |
| int emptyCount = 0; |
| int fullCount = 0; |
| for (TestReference r = TestReference.head; r != null; r = r.next) { |
| if (r.get() == null) emptyCount++; |
| else fullCount++; |
| } |
| |
| System.err.println(fullCount + " full, " + emptyCount + " empty "); |
| |
| } |
| |
| } |