1/*
2 * Copyright (c) 2006, 2011, 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 6399443
27 * @summary Check for auto-shutdown and gc of singleThreadExecutors
28 * @library /lib/testlibrary/
29 * @run main/othervm/timeout=1000 AutoShutdown
30 * @author Martin Buchholz
31 */
32
33import static java.util.concurrent.Executors.defaultThreadFactory;
34import static java.util.concurrent.Executors.newSingleThreadExecutor;
35
36import static java.util.concurrent.TimeUnit.MILLISECONDS;
37
38import java.lang.ref.WeakReference;
39import java.util.Arrays;
40import java.util.concurrent.ConcurrentLinkedQueue;
41import java.util.concurrent.CountDownLatch;
42import java.util.concurrent.Executor;
43import java.util.concurrent.TimeUnit;
44import jdk.testlibrary.Utils;
45
46public class AutoShutdown {
47    static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
48
49    static void await(CountDownLatch latch) throws InterruptedException {
50        if (!latch.await(LONG_DELAY_MS, MILLISECONDS))
51            throw new AssertionError("timed out waiting for latch");
52    }
53
54    private static void realMain(String[] args) throws Throwable {
55        final Executor[] executors = {
56            newSingleThreadExecutor(),
57            newSingleThreadExecutor(defaultThreadFactory()),
58            // TODO: should these executors also auto-shutdown?
59            //newFixedThreadPool(1),
60            //newSingleThreadScheduledExecutor(),
61            //newSingleThreadScheduledExecutor(defaultThreadFactory()),
62        };
63        final ConcurrentLinkedQueue<WeakReference<Thread>> poolThreads
64            = new ConcurrentLinkedQueue<>();
65        final CountDownLatch threadStarted
66            = new CountDownLatch(executors.length);
67        final CountDownLatch pleaseProceed
68            = new CountDownLatch(1);
69        Runnable task = new Runnable() { public void run() {
70            try {
71                poolThreads.add(new WeakReference<>(Thread.currentThread()));
72                threadStarted.countDown();
73                await(pleaseProceed);
74            } catch (Throwable t) { unexpected(t); }
75        }};
76        for (Executor executor : executors)
77            executor.execute(task);
78        await(threadStarted);
79        pleaseProceed.countDown();
80        Arrays.fill(executors, null);   // make executors unreachable
81        boolean done = false;
82        for (long timeout = 1L; !done && timeout <= 128L; timeout *= 2) {
83            System.gc();
84            done = true;
85            for (WeakReference<Thread> ref : poolThreads) {
86                Thread thread = ref.get();
87                if (thread != null) {
88                    TimeUnit.SECONDS.timedJoin(thread, timeout);
89                    if (thread.isAlive())
90                        done = false;
91                }
92            }
93        }
94        if (!done)
95            throw new AssertionError("pool threads did not terminate");
96    }
97
98    //--------------------- Infrastructure ---------------------------
99    static volatile int passed = 0, failed = 0;
100    static void pass() {passed++;}
101    static void fail() {failed++; Thread.dumpStack();}
102    static void fail(String msg) {System.out.println(msg); fail();}
103    static void unexpected(Throwable t) {failed++; t.printStackTrace();}
104    static void equal(Object x, Object y) {
105        if (x == null ? y == null : x.equals(y)) pass();
106        else fail(x + " not equal to " + y);}
107    public static void main(String[] args) throws Throwable {
108        try {realMain(args);} catch (Throwable t) {unexpected(t);}
109        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
110        if (failed > 0) throw new AssertionError("Some tests failed");}
111}
112