1 |
/* |
2 |
* Copyright (c) 1999, 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 |
* @bug 4268780 |
27 |
* @summary Collection-views of submap-views of synchronized-views of |
28 |
* SortedMap objects do not synchronize on the correct object. |
29 |
* (Got that?) |
30 |
*/ |
31 |
|
32 |
import java.util.Collection; |
33 |
import java.util.Collections; |
34 |
import java.util.Map; |
35 |
import java.util.SortedMap; |
36 |
import java.util.TreeMap; |
37 |
|
38 |
public class ViewSynch { |
39 |
static final Integer ZERO = new Integer(0); |
40 |
static final Int INT_ZERO = new Int(0); |
41 |
static final Int INT_ONE = new Int(1); |
42 |
static SortedMap m = Collections.synchronizedSortedMap(new TreeMap()); |
43 |
static Map m2 = m.tailMap(ZERO); |
44 |
static Collection c = m2.values(); |
45 |
|
46 |
public static void main(String[] args) { |
47 |
for (int i=0; i<10000; i++) |
48 |
m.put(new Integer(i), INT_ZERO); |
49 |
|
50 |
new Thread() { |
51 |
public void run() { |
52 |
for (int i=0; i<100; i++) { |
53 |
Thread.yield(); |
54 |
m.remove(ZERO); |
55 |
m.put(ZERO, INT_ZERO); |
56 |
} |
57 |
} |
58 |
}.start(); |
59 |
|
60 |
c.contains(INT_ONE); |
61 |
} |
62 |
} |
63 |
|
64 |
/** |
65 |
* Like Integer, except yields while doing equals comparison, to allow |
66 |
* for interleaving. |
67 |
*/ |
68 |
class Int { |
69 |
Integer x; |
70 |
Int(int i) {x = new Integer(i);} |
71 |
|
72 |
public boolean equals(Object o) { |
73 |
Thread.yield(); |
74 |
Int i = (Int)o; |
75 |
return x.equals(i.x); |
76 |
} |
77 |
|
78 |
public int hashCode() {return x.hashCode();} |
79 |
} |