/[cvs]/jsr166/src/test/tck/SystemTest.java
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Contents of /jsr166/src/test/tck/SystemTest.java

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Revision 1.5 - (show annotations)
Sat Dec 27 19:26:44 2003 UTC (15 years, 7 months ago) by dl
Branch: MAIN
Changes since 1.4: +5 -4 lines
Headers reference Creative Commons

1 /*
2 * Written by Doug Lea with assistance from members of JCP JSR-166
3 * Expert Group and released to the public domain, as explained at
4 * http://creativecommons.org/licenses/publicdomain
5 * Other contributors include Andrew Wright, Jeffrey Hayes,
6 * Pat Fisher, Mike Judd.
7 */
8
9 import junit.framework.*;
10
11 public class SystemTest extends JSR166TestCase {
12 public static void main(String[] args) {
13 junit.textui.TestRunner.run(suite());
14 }
15
16 public static Test suite() {
17 return new TestSuite(SystemTest.class);
18 }
19
20 /**
21 * Nanos between readings of millis is no longer than millis (plus
22 * one milli to allow for rounding).
23 * This shows only that nano timing not (much) worse than milli.
24 */
25 public void testNanoTime1() {
26 try {
27 long m1 = System.currentTimeMillis();
28 Thread.sleep(1);
29 long n1 = System.nanoTime();
30 Thread.sleep(SHORT_DELAY_MS);
31 long n2 = System.nanoTime();
32 Thread.sleep(1);
33 long m2 = System.currentTimeMillis();
34 long millis = m2 - m1;
35 long nanos = n2 - n1;
36
37 assertTrue(nanos >= 0);
38 assertTrue(nanos < (millis+1) * 1000000);
39 }
40 catch(InterruptedException ie) {
41 unexpectedException();
42 }
43 }
44
45 /**
46 * Millis between readings of nanos is no longer than nanos
47 * This shows only that nano timing not (much) worse than milli.
48 */
49 public void testNanoTime2() {
50 try {
51 long n1 = System.nanoTime();
52 Thread.sleep(1);
53 long m1 = System.currentTimeMillis();
54 Thread.sleep(SHORT_DELAY_MS);
55 long m2 = System.currentTimeMillis();
56 Thread.sleep(1);
57 long n2 = System.nanoTime();
58 long millis = m2 - m1;
59 long nanos = n2 - n1;
60
61 assertTrue(nanos >= 0);
62 assertTrue(millis * 1000000 <= nanos);
63 }
64 catch(InterruptedException ie) {
65 unexpectedException();
66 }
67 }
68
69 }
70

dl@cs.oswego.edu
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