50 lines
1.7 KiB
Java
50 lines
1.7 KiB
Java
/*
|
|
* Copyright (c) 2015, 2016, 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
|
|
* @summary Make sure pageSize() returns a value that is a power of two
|
|
* @library /test/lib
|
|
* @modules java.base/jdk.internal.misc
|
|
* java.management
|
|
* @run main PageSize
|
|
*/
|
|
|
|
import java.lang.reflect.Field;
|
|
import jdk.internal.misc.Unsafe;
|
|
import static jdk.test.lib.Asserts.*;
|
|
|
|
public class PageSize {
|
|
public static void main(String args[]) throws Exception {
|
|
Unsafe unsafe = Unsafe.getUnsafe();
|
|
int pageSize = unsafe.pageSize();
|
|
|
|
for (int n = 1; n != 0; n <<= 1) {
|
|
if (pageSize == n) {
|
|
return;
|
|
}
|
|
}
|
|
throw new RuntimeException("Expected pagesize to be a power of two, actual pagesize:" + pageSize);
|
|
}
|
|
}
|