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/*
* Copyright (c) 2007, 2022, 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 4518797
* @summary Make sure that hashCode() and read/writeObject() are thread-safe.
* @run main Bug4518797 10
*/
import java.util.*;
import java.io.*;
// Usage: java Bug4518797 [duration]
public class Bug4518797 {
static volatile boolean runrun = true;
static volatile String message = null;
public static void main(String[] args) {
int duration = 180;
if (args.length == 1) {
duration = Math.max(5, Integer.parseInt(args[0]));
}
final Locale loc = Locale.of("ja", "US");
final int hashcode = loc.hashCode();
System.out.println("correct hash code: " + hashcode);
Thread t1 = new Thread(new Runnable() {
public void run() {
while (runrun) {
int hc = loc.hashCode();
if (hc != hashcode) {
runrun = false;
message = "t1: wrong hashcode: " + hc;
}
}
}
});
Thread t2 = new Thread(new Runnable() {
public void run() {
// Repeat serialization and deserialization. And get the
// hash code from a deserialized Locale object.
while (runrun) {
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(loc);
byte[] b = baos.toByteArray();
oos.close();
ByteArrayInputStream bais = new ByteArrayInputStream(b);
ObjectInputStream ois = new ObjectInputStream(bais);
Locale loc2 = (Locale) ois.readObject();
int hc = loc2.hashCode();
if (hc != hashcode) {
runrun = false;
message = "t2: wrong hashcode: " + hc;
}
} catch (IOException ioe) {
runrun = false;
throw new RuntimeException("t2: can't perform test", ioe);
} catch (ClassNotFoundException cnfe) {
runrun = false;
throw new RuntimeException("t2: can't perform test", cnfe);
}
}
}
});
t1.start();
t2.start();
try {
for (int i = 0; runrun && i < duration; i++) {
Thread.sleep(1000);
}
runrun = false;
t1.join();
t2.join();
} catch (InterruptedException e) {
}
if (message != null) {
throw new RuntimeException(message);
}
}
}
¤ Dauer der Verarbeitung: 0.20 Sekunden
(vorverarbeitet)
¤
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