1 /*
2 * Copyright (c) 2006, 2018, 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 6431315
27 * @summary ExecutorService.invokeAll might hang
28 * @author Martin Buchholz
29 * @library /test/lib
30 */
31
32 import static java.util.concurrent.TimeUnit.MILLISECONDS;
33
34 import java.util.ArrayList;
35 import java.util.Collection;
36 import java.util.concurrent.Callable;
37 import java.util.concurrent.ExecutorService;
38 import java.util.concurrent.Executors;
39 import java.util.concurrent.RejectedExecutionException;
40 import jdk.test.lib.Utils;
41
42 /**
43 * Adapted from Doug Lea, which was...
44 * adapted from a posting by Tom Sugden tom at epcc.ed.ac.uk
45 */
46 public class BlockingTaskExecutor {
47 static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
48
49 static void realMain(String[] args) throws Throwable {
50 for (int i = 1; i <= 100; i++) {
51 System.out.print(".");
52 test();
53 }
54 }
55
56 static void test() throws Throwable {
57 final ExecutorService executor = Executors.newCachedThreadPool();
58
59 final NotificationReceiver notifiee1 = new NotificationReceiver();
60 final NotificationReceiver notifiee2 = new NotificationReceiver();
61
62 final Collection<Callable<Object>> tasks = new ArrayList<>();
63 tasks.add(new BlockingTask(notifiee1));
64 tasks.add(new BlockingTask(notifiee2));
65 tasks.add(new NonBlockingTask());
66
67 // start a thread to invoke the tasks
68 Thread thread = new Thread() { public void run() {
69 try { executor.invokeAll(tasks); }
70 catch (RejectedExecutionException t) {/* OK */}
71 catch (Throwable t) { unexpected(t); }}};
72 thread.start();
73
74 // Wait until tasks begin execution
75 notifiee1.waitForNotification();
76 notifiee2.waitForNotification();
77
78 // Now try to shutdown the executor service while tasks
79 // are blocked. This should cause the tasks to be
80 // interrupted.
81 executor.shutdownNow();
82 if (! executor.awaitTermination(LONG_DELAY_MS, MILLISECONDS))
83 throw new Error(
84 String.format("Executor termination timed out after %d ms",
85 LONG_DELAY_MS));
86
87 // Wait for the invocation thread to complete.
88 thread.join(LONG_DELAY_MS);
89 if (thread.isAlive()) {
90 thread.interrupt();
91 thread.join(LONG_DELAY_MS);
92 throw new Error(
93 String.format("invokeAll timed out after %d ms",
94 LONG_DELAY_MS));
95 }
96 }
97
98 /**
99 * A helper class with a method to wait for a notification.
100 *
101 * The notification is received via the
102 * {@code sendNotification} method.
103 */
104 static class NotificationReceiver {
105 /** Has the notifiee been notified? */
106 boolean notified = false;
107
108 /**
109 * Notify the notification receiver.
110 */
111 public synchronized void sendNotification() {
112 notified = true;
113 notifyAll();
114 }
115
116 /**
117 * Waits until a notification has been received.
118 *
119 * @throws InterruptedException if the wait is interrupted
120 */
121 public synchronized void waitForNotification()
122 throws InterruptedException {
123 while (! notified)
124 wait();
125 }
126 }
127
128 /**
129 * A callable task that blocks until it is interrupted.
130 * This task sends a notification to a notification receiver when
131 * it is first called.
132 */
133 static class BlockingTask implements Callable<Object> {
134 private final NotificationReceiver notifiee;
135
136 BlockingTask(NotificationReceiver notifiee) {
137 this.notifiee = notifiee;
138 }
139
140 public Object call() throws InterruptedException {
141 notifiee.sendNotification();
142
143 // wait indefinitely until task is interrupted
144 while (true) {
145 synchronized (this) {
146 wait();
147 }
148 }
149 }
150 }
151
152 /**
153 * A callable task that simply returns a string result.
154 */
155 static class NonBlockingTask implements Callable<Object> {
156 public Object call() {
157 return "NonBlockingTaskResult";
158 }
159 }
160
161 //--------------------- Infrastructure ---------------------------
162 static volatile int passed = 0, failed = 0;
163 static void pass() {passed++;}
164 static void fail() {failed++; Thread.dumpStack();}
165 static void fail(String msg) {System.out.println(msg); fail();}
166 static void unexpected(Throwable t) {failed++; t.printStackTrace();}
167 static void check(boolean cond) {if (cond) pass(); else fail();}
168 static void equal(Object x, Object y) {
169 if (x == null ? y == null : x.equals(y)) pass();
170 else fail(x + " not equal to " + y);}
171 public static void main(String[] args) throws Throwable {
172 try {realMain(args);} catch (Throwable t) {unexpected(t);}
173 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
174 if (failed > 0) throw new AssertionError("Some tests failed");}
175 }