11 |
|
|
12 |
|
public class SystemTest extends JSR166TestCase { |
13 |
|
public static void main(String[] args) { |
14 |
< |
junit.textui.TestRunner.run(suite()); |
14 |
> |
main(suite(), args); |
15 |
|
} |
16 |
|
|
17 |
|
public static Test suite() { |
27 |
|
|
28 |
|
/** |
29 |
|
* Nanos between readings of millis is no longer than millis (plus |
30 |
< |
* possible rounding). |
30 |
> |
* possible rounding), and vice versa. |
31 |
|
* This shows only that nano timing not (much) worse than milli. |
32 |
|
*/ |
33 |
< |
public void testNanoTime1() throws InterruptedException { |
34 |
< |
long m1 = System.currentTimeMillis(); |
35 |
< |
Thread.sleep(1); |
36 |
< |
long n1 = System.nanoTime(); |
37 |
< |
Thread.sleep(SHORT_DELAY_MS); |
38 |
< |
long n2 = System.nanoTime(); |
39 |
< |
Thread.sleep(1); |
40 |
< |
long m2 = System.currentTimeMillis(); |
41 |
< |
long millis = m2 - m1; |
42 |
< |
long nanos = n2 - n1; |
43 |
< |
assertTrue(nanos >= 0); |
44 |
< |
long nanosAsMillis = nanos / 1000000; |
45 |
< |
assertTrue(nanosAsMillis <= millis + MILLIS_ROUND); |
46 |
< |
} |
47 |
< |
|
48 |
< |
/** |
49 |
< |
* Millis between readings of nanos is less than nanos, adjusting |
50 |
< |
* for rounding. |
51 |
< |
* This shows only that nano timing not (much) worse than milli. |
52 |
< |
*/ |
53 |
< |
public void testNanoTime2() throws InterruptedException { |
54 |
< |
long n1 = System.nanoTime(); |
33 |
> |
public void testNanoTime() throws InterruptedException { |
34 |
> |
long m0 = System.currentTimeMillis(); |
35 |
> |
long n0 = System.nanoTime(); |
36 |
|
Thread.sleep(1); |
37 |
|
long m1 = System.currentTimeMillis(); |
38 |
< |
Thread.sleep(SHORT_DELAY_MS); |
38 |
> |
long n1 = System.nanoTime(); |
39 |
> |
Thread.sleep(50); // avoid possibly scaled SHORT_DELAY_MS |
40 |
|
long m2 = System.currentTimeMillis(); |
59 |
– |
Thread.sleep(1); |
41 |
|
long n2 = System.nanoTime(); |
42 |
< |
long millis = m2 - m1; |
43 |
< |
long nanos = n2 - n1; |
44 |
< |
|
45 |
< |
assertTrue(nanos >= 0); |
46 |
< |
long nanosAsMillis = nanos / 1000000; |
66 |
< |
assertTrue(millis <= nanosAsMillis + MILLIS_ROUND); |
42 |
> |
Thread.sleep(1); |
43 |
> |
long m3 = System.currentTimeMillis(); |
44 |
> |
long n3 = System.nanoTime(); |
45 |
> |
assertTrue((n2 - n1) / 1_000_000 <= m3 - m0 + MILLIS_ROUND); |
46 |
> |
assertTrue(m2 - m1 <= (n3 - n0) / 1_000_000 + MILLIS_ROUND); |
47 |
|
} |
68 |
– |
|
48 |
|
} |