1/*
2 * Copyright (c) 2007, 2014, 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 6523756
27 * @summary Race task submission against shutdownNow
28 * @author Martin Buchholz
29 */
30
31// For extra chances to detect shutdownNow vs. execute races,
32// crank up the iterations to, say 1<<22 and
33// add a call to Thread.yield() before the call to t.start()
34// in ThreadPoolExecutor.addWorker.
35
36import java.util.concurrent.ArrayBlockingQueue;
37import java.util.concurrent.RejectedExecutionException;
38import java.util.concurrent.ThreadPoolExecutor;
39import java.util.concurrent.TimeUnit;
40
41public class ShutdownNowExecuteRace {
42    static volatile boolean quit = false;
43    static volatile ThreadPoolExecutor pool = null;
44
45    static final Runnable sleeper = new Runnable() { public void run() {
46        final long ONE_HOUR = 1000L * 60L * 60L;
47        try { Thread.sleep(ONE_HOUR); }
48        catch (InterruptedException ie) {}
49        catch (Throwable t) { unexpected(t); }}};
50
51    static void realMain(String[] args) throws Throwable {
52        final int iterations = 1 << 8;
53        Thread thread = new Thread() { public void run() {
54            while (! quit) {
55                ThreadPoolExecutor pool = ShutdownNowExecuteRace.pool;
56                if (pool != null)
57                    try { pool.execute(sleeper); }
58                    catch (RejectedExecutionException e) {/* OK */}
59                    catch (Throwable t) { unexpected(t); }}}};
60        thread.start();
61        for (int i = 0; i < iterations; i++) {
62            pool = new ThreadPoolExecutor(
63                10, 10, 3L, TimeUnit.DAYS,
64                new ArrayBlockingQueue<Runnable>(10));
65            pool.shutdownNow();
66            check(pool.awaitTermination(3L, TimeUnit.MINUTES));
67        }
68        quit = true;
69        thread.join();
70    }
71
72    //--------------------- Infrastructure ---------------------------
73    static volatile int passed = 0, failed = 0;
74    static void pass() {passed++;}
75    static void fail() {failed++; Thread.dumpStack();}
76    static void fail(String msg) {System.out.println(msg); fail();}
77    static void unexpected(Throwable t) {failed++; t.printStackTrace();}
78    static void check(boolean cond) {if (cond) pass(); else fail();}
79    static void equal(Object x, Object y) {
80        if (x == null ? y == null : x.equals(y)) pass();
81        else fail(x + " not equal to " + y);}
82    public static void main(String[] args) throws Throwable {
83        try {realMain(args);} catch (Throwable t) {unexpected(t);}
84        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
85        if (failed > 0) throw new AssertionError("Some tests failed");}
86    private abstract static class CheckedThread extends Thread {
87        abstract void realRun() throws Throwable;
88        public void run() {
89            try {realRun();} catch (Throwable t) {unexpected(t);}}}
90}
91