1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*
* Copyright (c) 2006, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 6399443
* @summary Check for auto-shutdown and gc of singleThreadExecutors
* @library /lib/testlibrary/
* @run main/othervm/timeout=1000 AutoShutdown
* @author Martin Buchholz
*/
import static java.util.concurrent.Executors.defaultThreadFactory;
import static java.util.concurrent.Executors.newSingleThreadExecutor;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.lang.ref.WeakReference;
import java.util.Arrays;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import jdk.testlibrary.Utils;
public class AutoShutdown {
static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
static void await(CountDownLatch latch) throws InterruptedException {
if (!latch.await(LONG_DELAY_MS, MILLISECONDS))
throw new AssertionError("timed out waiting for latch");
}
private static void realMain(String[] args) throws Throwable {
final Executor[] executors = {
newSingleThreadExecutor(),
newSingleThreadExecutor(defaultThreadFactory()),
// TODO: should these executors also auto-shutdown?
//newFixedThreadPool(1),
//newSingleThreadScheduledExecutor(),
//newSingleThreadScheduledExecutor(defaultThreadFactory()),
};
final ConcurrentLinkedQueue<WeakReference<Thread>> poolThreads
= new ConcurrentLinkedQueue<>();
final CountDownLatch threadStarted
= new CountDownLatch(executors.length);
final CountDownLatch pleaseProceed
= new CountDownLatch(1);
Runnable task = new Runnable() { public void run() {
try {
poolThreads.add(new WeakReference<>(Thread.currentThread()));
threadStarted.countDown();
await(pleaseProceed);
} catch (Throwable t) { unexpected(t); }
}};
for (Executor executor : executors)
executor.execute(task);
await(threadStarted);
pleaseProceed.countDown();
Arrays.fill(executors, null); // make executors unreachable
boolean done = false;
for (long timeout = 1L; !done && timeout <= 128L; timeout *= 2) {
System.gc();
done = true;
for (WeakReference<Thread> ref : poolThreads) {
Thread thread = ref.get();
if (thread != null) {
TimeUnit.SECONDS.timedJoin(thread, timeout);
if (thread.isAlive())
done = false;
}
}
}
if (!done)
throw new AssertionError("pool threads did not terminate");
}
//--------------------- Infrastructure ---------------------------
static volatile int passed = 0, failed = 0;
static void pass() {passed++;}
static void fail() {failed++; Thread.dumpStack();}
static void fail(String msg) {System.out.println(msg); fail();}
static void unexpected(Throwable t) {failed++; t.printStackTrace();}
static void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
try {realMain(args);} catch (Throwable t) {unexpected(t);}
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
}
|
