76 lines
2.3 KiB
Java
76 lines
2.3 KiB
Java
/*
|
|
* Copyright (c) 2000, 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 4363076
|
|
* @summary Basic functional test of Thread.holdsLock(Object)
|
|
* @author Josh Bloch and Steffen Grarup
|
|
*/
|
|
|
|
public class HoldsLock {
|
|
private static Object target = null;
|
|
|
|
private static void checkLock(boolean value) {
|
|
if (Thread.holdsLock(target) != value)
|
|
throw new RuntimeException("Should be " + value);
|
|
}
|
|
|
|
static class LockThread extends Thread {
|
|
public void run() {
|
|
checkLock(false);
|
|
synchronized(target) {
|
|
checkLock(true);
|
|
}
|
|
checkLock(false);
|
|
}
|
|
}
|
|
|
|
public static void main(String args[]) throws Exception {
|
|
// Test null obj case
|
|
try {
|
|
checkLock(false);
|
|
throw new RuntimeException("NullPointerException not thrown");
|
|
} catch (NullPointerException e) {
|
|
};
|
|
|
|
// Test uncontested case
|
|
target = new Object();
|
|
checkLock(false);
|
|
synchronized(target) {
|
|
checkLock(true);
|
|
}
|
|
checkLock(false);
|
|
|
|
// Test contested case
|
|
synchronized(target) {
|
|
checkLock(true);
|
|
new LockThread().start();
|
|
checkLock(true);
|
|
Thread.sleep(100);
|
|
checkLock(true);
|
|
}
|
|
checkLock(false);
|
|
}
|
|
}
|