14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @summary Make sure pageSize() returns a value that is a power of two
  27  * @library /test/lib
  28  * @modules java.base/jdk.internal.misc
  29  *          java.management
  30  * @run main PageSize
  31  */
  32 
  33 import java.lang.reflect.Field;
  34 import jdk.test.lib.unsafe.UnsafeHelper;
  35 import jdk.internal.misc.Unsafe;
  36 import static jdk.test.lib.Asserts.*;
  37 
  38 public class PageSize {
  39     public static void main(String args[]) throws Exception {
  40         Unsafe unsafe = UnsafeHelper.getUnsafe();
  41         int pageSize = unsafe.pageSize();
  42 
  43         for (int n = 1; n != 0; n <<= 1) {
  44             if (pageSize == n) {
  45                 return;
  46             }
  47         }
  48         throw new RuntimeException("Expected pagesize to be a power of two, actual pagesize:" + pageSize);
  49     }
  50 }

  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @summary Make sure pageSize() returns a value that is a power of two
  27  * @library /test/lib
  28  * @modules java.base/jdk.internal.misc
  29  *          java.management
  30  * @run main PageSize
  31  */
  32 
  33 import java.lang.reflect.Field;

  34 import jdk.internal.misc.Unsafe;
  35 import static jdk.test.lib.Asserts.*;
  36 
  37 public class PageSize {
  38     public static void main(String args[]) throws Exception {
  39         Unsafe unsafe = Unsafe.getUnsafe();
  40         int pageSize = unsafe.pageSize();
  41 
  42         for (int n = 1; n != 0; n <<= 1) {
  43             if (pageSize == n) {
  44                 return;
  45             }
  46         }
  47         throw new RuntimeException("Expected pagesize to be a power of two, actual pagesize:" + pageSize);
  48     }
  49 }