1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5  * This code is free software; you can redistribute it and/or modify it
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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
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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
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22  */
23 
24 /*
25  * @test
26  * @bug 7132378
27  * @summary Race in FutureTask if used with explicit set ( not Runnable )
28  * @author Chris Hegarty
29  */
30 
31 import java.util.concurrent.Callable;
32 import java.util.concurrent.FutureTask;
33 
34 public class ExplicitSet {
35 
realMain(String[] args)36     static void realMain(String[] args) throws Throwable {
37         for (int i = 1; i <= 10000; i++) {
38             //System.out.print(".");
39             test();
40         }
41     }
42 
test()43     static void test() throws Throwable {
44         final SettableTask task = new SettableTask();
45 
46         Thread thread = new Thread() { public void run() {
47             try {
48                 check(task.get() != null);
49             } catch (Exception e) { unexpected(e); }
50         }};
51         thread.start();
52 
53         task.set(Boolean.TRUE);
54         thread.join(5000);
55     }
56 
57     static class SettableTask extends FutureTask<Boolean> {
SettableTask()58         SettableTask() {
59             super(new Callable<Boolean>() {
60                     public Boolean call() {
61                         fail("The task should never be run!");
62                         return null;
63                     }
64                 });
65         }
66 
67         @Override
set(Boolean b)68         public void set(Boolean b) {
69             super.set(b);
70         }
71     }
72 
73     //--------------------- Infrastructure ---------------------------
74     static volatile int passed = 0, failed = 0;
pass()75     static void pass() {passed++;}
fail()76     static void fail() {failed++; Thread.dumpStack();}
fail(String msg)77     static void fail(String msg) {System.out.println(msg); fail();}
unexpected(Throwable t)78     static void unexpected(Throwable t) {failed++; t.printStackTrace();}
check(boolean cond)79     static void check(boolean cond) {if (cond) pass(); else fail();}
equal(Object x, Object y)80     static void equal(Object x, Object y) {
81         if (x == null ? y == null : x.equals(y)) pass();
82         else fail(x + " not equal to " + y);}
main(String[] args)83     public static void main(String[] args) throws Throwable {
84         try {realMain(args);} catch (Throwable t) {unexpected(t);}
85         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
86         if (failed > 0) throw new AssertionError("Some tests failed");}
87 }
88