jdk/test/java/util/concurrent/atomic/VMSupportsCS8.java

/*
 * Copyright 2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 * @test
 * @bug 4992443 4994819
 * @compile -source 1.5 VMSupportsCS8.java
 * @run main VMSupportsCS8
 * @summary Checks that the value of VMSupportsCS8 matches system properties.
 */

import java.lang.reflect.Field;

public class VMSupportsCS8 {
    public static void main(String[] args) throws Exception {
        if (System.getProperty("sun.cpu.isalist").matches
            (".*\\b(sparcv9|pentium_pro|ia64|amd64).*")
            ||
            System.getProperty("os.arch").matches
            (".*\\b(ia64|amd64).*")) {

            System.out.println("This system is known to have hardware CS8");

            Class klass = Class.forName("java.util.concurrent.atomic.AtomicLong");
            Field field = klass.getDeclaredField("VM_SUPPORTS_LONG_CAS");
            field.setAccessible(true);
            boolean VMSupportsCS8 = field.getBoolean(null);
            if (! VMSupportsCS8)
                throw new Exception("Unexpected value for VMSupportsCS8");
        }
    }
}