1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 /** 18 * Exercise Object.wait(), comparing results against wall clock time. 19 */ 20 public class Main { 21 /* delays, in milliseconds */ 22 private final static long[] DELAYS = { 23 200, 500, 1000, 2000, 3500, 8000 24 }; 25 26 public static void main(String[] args) { 27 boolean timing = (args.length >= 1) && args[0].equals("--timing"); 28 doit(timing); 29 } 30 31 public static void doit(boolean timing) { 32 Object sleepy = new Object(); 33 long start, end; 34 35 synchronized (sleepy) { 36 try { 37 sleepy.wait(-500); 38 System.out.println("HEY: didn't throw on negative arg"); 39 } catch (IllegalArgumentException iae) { 40 System.out.println("Caught expected exception on neg arg"); 41 } catch (InterruptedException ie) { 42 ie.printStackTrace(); 43 } 44 45 for (long delay : DELAYS) { 46 System.out.println("Waiting for " + delay + "ms..."); 47 48 start = System.currentTimeMillis(); 49 try { 50 sleepy.wait(delay); 51 } catch (InterruptedException ie) { 52 ie.printStackTrace(); 53 } 54 end = System.currentTimeMillis(); 55 56 long elapsed = end - start; 57 boolean showTime = timing; 58 59 if (! timing) { 60 long epsilon = delay / 10; 61 if (epsilon > 50) { 62 epsilon = 50; 63 } 64 65 long min = delay - epsilon; 66 long max = delay + epsilon; 67 68 if (elapsed < min) { 69 System.out.println(" Elapsed time was too short"); 70 showTime = true; 71 } else if (elapsed > max) { 72 System.out.println(" Elapsed time was too long: " 73 + "elapsed=" + elapsed + " max=" + max); 74 showTime = true; 75 } 76 } 77 78 if (showTime) { 79 System.out.println(" Wall clock elapsed " 80 + elapsed + "ms"); 81 } 82 } 83 } 84 } 85 } 86
