hotspot/test/runtime/Unsafe/PageSize.java
author ctornqvi
Fri, 23 Jan 2015 11:44:21 -0800
changeset 28732 d4b650e48a8f
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permissions -rw-r--r--
8069207: [TESTBUG] Exception thrown for java.lang.NoSuchMethodError: sun.misc.Unsafe.monitorExit Reviewed-by: gtriantafill, dholmes
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/*
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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/*
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 * @test
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 * @summary Make sure pageSize() returns a value that is a power of two
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 * @library /testlibrary
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 * @run main PageSize
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 */
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import java.lang.reflect.Field;
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import com.oracle.java.testlibrary.*;
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import sun.misc.Unsafe;
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import static com.oracle.java.testlibrary.Asserts.*;
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public class PageSize {
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    public static void main(String args[]) throws Exception {
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        Unsafe unsafe = Utils.getUnsafe();
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        int pageSize = unsafe.pageSize();
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        for (int n = 1; n != 0; n <<= 1) {
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            if (pageSize == n) {
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                return;
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            }
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        }
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        throw new RuntimeException("Expected pagesize to be a power of two, actual pagesize:" + pageSize);
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    }
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}