7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 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 /testlibrary 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.*; 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 = Utils.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 } | 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 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.Utils; 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 = Utils.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 } |