Bash.java revision 12745:f068a4ffddd2 
1/*
2 * Copyright (c) 1997, 1998, 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/* @test
25 * @bug 4076283
26 * @summary java.lang.ref.SoftReference should reliably prevent
27 *          OutOfMemoryErrors
28 * @author Peter Jones
29 * @author Mark Reinhold
30 */
31
32/* If this test fails, an OutOfMemoryError will be thrown */
33
34import java.lang.ref.SoftReference;
35
36
37public class Bash {
38
39    static class TestReference extends SoftReference {
40
41        public static TestReference head;
42        public TestReference next;
43
44        public TestReference(Object referent) {
45            super(referent);
46            next = head;
47            head = this;
48        }
49    }
50
51
52    static final int NUM_BLOCKS = 2048;
53    static final int BLOCK_SIZE = 32768;
54
55
56    public static void main(String[] args) throws Exception {
57
58        for (int i = 0; i < NUM_BLOCKS; ++ i) {
59            TestReference ref = new TestReference(new byte[BLOCK_SIZE]);
60        }
61
62        int emptyCount = 0;
63        int fullCount = 0;
64        for (TestReference r = TestReference.head; r != null; r = r.next) {
65            if (r.get() == null) emptyCount++;
66            else fullCount++;
67        }
68
69        System.err.println(fullCount + " full, " + emptyCount + " empty ");
70
71    }
72
73}
74