1 /* 2 * Copyright (c) 2007, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 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 package org.graalvm.compiler.jtt.jdk; 24 25 import org.junit.Test; 26 27 import org.graalvm.compiler.jtt.JTTTest; 28 29 /* 30 */ 31 public class System_nanoTime02 extends JTTTest { 32 33 public static boolean test() { 34 long minDelta = Long.MAX_VALUE; 35 36 // the first call to System.nanoTime might take a long time due to call resolution 37 for (int c = 0; c < 10; c++) { 38 long start = System.nanoTime(); 39 long delta = 0; 40 int i; 41 for (i = 0; delta == 0 && i < 50000; i++) { 42 delta = System.nanoTime() - start; 43 // do nothing. 44 } 45 if (delta < minDelta) { 46 minDelta = delta; 47 } 48 } 49 50 // better get at least 30 microsecond resolution. 51 return minDelta > 1 && minDelta < 30000; 52 } 53 54 @Test 55 public void run0() throws Throwable { 56 runTest("test"); 57 } 58 59 }