1 // Copyright 2007 The Android Open Source Project 2 3 /** 4 * Exercise Object.wait(), comparing results against wall clock time. 5 */ 6 public class Main { 7 /* delays, in milliseconds */ 8 private final static long[] DELAYS = { 9 200, 500, 1000, 2000, 3500, 8000 10 }; 11 main(String[] args)12 public static void main(String[] args) { 13 boolean timing = (args.length >= 1) && args[0].equals("--timing"); 14 doit(timing); 15 } 16 doit(boolean timing)17 public static void doit(boolean timing) { 18 Object sleepy = new Object(); 19 long start, end; 20 21 synchronized (sleepy) { 22 try { 23 sleepy.wait(-500); 24 System.out.println("HEY: didn't throw on negative arg"); 25 } catch (IllegalArgumentException iae) { 26 System.out.println("Caught expected exception on neg arg"); 27 } catch (InterruptedException ie) { 28 ie.printStackTrace(); 29 } 30 31 for(long delay : DELAYS) { 32 System.out.println("Waiting for " + delay + "ms..."); 33 34 start = System.currentTimeMillis(); 35 try { 36 sleepy.wait(delay); 37 } catch (InterruptedException ie) { 38 ie.printStackTrace(); 39 } 40 end = System.currentTimeMillis(); 41 42 long elapsed = end - start; 43 boolean showTime = timing; 44 45 if (! timing) { 46 long epsilon = delay / 10; 47 if (epsilon > 50) { 48 epsilon = 50; 49 } 50 51 long min = delay - epsilon; 52 long max = delay + epsilon; 53 54 if (elapsed < min) { 55 System.out.println(" Elapsed time was too short"); 56 showTime = true; 57 } else if (elapsed > max) { 58 System.out.println(" Elapsed time was too long: " 59 + "elapsed=" + elapsed + " max=" + max); 60 showTime = true; 61 } 62 } 63 64 if (showTime) { 65 System.out.println(" Wall clock elapsed " 66 + elapsed + "ms"); 67 } 68 } 69 } 70 } 71 } 72 73