/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Exercise Object.wait(), comparing results against wall clock time.
*/
public class Main {
/* delays, in milliseconds */
private final static long[] DELAYS = {
200, 500, 1000, 2000, 3500, 8000
};
public static void main(String[] args) {
boolean timing = (args.length >= 1) && args[0].equals("--timing");
doit(timing);
}
public static void doit(boolean timing) {
Object sleepy = new Object();
long start, end;
synchronized (sleepy) {
try {
sleepy.wait(-500);
System.out.println("HEY: didn't throw on negative arg");
} catch (IllegalArgumentException iae) {
System.out.println("Caught expected exception on neg arg");
} catch (InterruptedException ie) {
ie.printStackTrace();
}
for (long delay : DELAYS) {
System.out.println("Waiting for " + delay + "ms...");
start = System.currentTimeMillis();
try {
sleepy.wait(delay);
} catch (InterruptedException ie) {
ie.printStackTrace();
}
end = System.currentTimeMillis();
long elapsed = end - start;
boolean showTime = timing;
if (! timing) {
long epsilon = delay / 10;
if (epsilon > 50) {
epsilon = 50;
}
long min = delay - epsilon;
long max = delay + epsilon;
if (elapsed < min) {
System.out.println(" Elapsed time was too short");
showTime = true;
} else if (elapsed > max) {
System.out.println(" Elapsed time was too long: "
+ "elapsed=" + elapsed + " max=" + max);
showTime = true;
}
}
if (showTime) {
System.out.println(" Wall clock elapsed "
+ elapsed + "ms");
}
}
}
}
}