1 |
dl |
1.1 |
/* |
2 |
dl |
1.5 |
* 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 |
dl |
1.1 |
*/ |
8 |
|
|
|
9 |
|
|
import junit.framework.*; |
10 |
|
|
|
11 |
dl |
1.2 |
public class SystemTest extends JSR166TestCase { |
12 |
dl |
1.1 |
public static void main(String[] args) { |
13 |
tim |
1.4 |
junit.textui.TestRunner.run(suite()); |
14 |
dl |
1.1 |
} |
15 |
|
|
|
16 |
|
|
public static Test suite() { |
17 |
tim |
1.4 |
return new TestSuite(SystemTest.class); |
18 |
dl |
1.1 |
} |
19 |
|
|
|
20 |
dl |
1.2 |
/** |
21 |
tim |
1.4 |
* Nanos between readings of millis is no longer than millis (plus |
22 |
|
|
* one milli to allow for rounding). |
23 |
dl |
1.2 |
* This shows only that nano timing not (much) worse than milli. |
24 |
|
|
*/ |
25 |
dl |
1.1 |
public void testNanoTime1() { |
26 |
dl |
1.2 |
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 |
tim |
1.4 |
assertTrue(nanos < (millis+1) * 1000000); |
39 |
dl |
1.2 |
} |
40 |
|
|
catch(InterruptedException ie) { |
41 |
dl |
1.3 |
unexpectedException(); |
42 |
dl |
1.2 |
} |
43 |
dl |
1.1 |
} |
44 |
|
|
|
45 |
dl |
1.2 |
/** |
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 |
dl |
1.1 |
public void testNanoTime2() { |
50 |
dl |
1.2 |
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 |
dl |
1.3 |
unexpectedException(); |
66 |
dl |
1.2 |
} |
67 |
dl |
1.1 |
} |
68 |
|
|
|
69 |
|
|
} |
70 |
|
|
|