/*

 * Copyright (c) 2015, 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.

 *

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 */

/*

 * @test

 * @summary Make sure pageSize() returns a value that is a power of two

 * @library /testlibrary

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @run main PageSize

 */

import java.lang.reflect.Field;

import jdk.test.lib.*;

import static jdk.test.lib.Asserts.*;

public class PageSize {

    public static void main(String args[]) throws Exception {

        Unsafe unsafe = Utils.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);

    }

}