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root/jsr166/jsr166/src/test/tck/SystemTest.java

Comparing jsr166/src/test/tck/SystemTest.java (file contents):
Revision 1.13 by jsr166, Sat Apr 25 04:55:31 2015 UTC vs.
Revision 1.14 by jsr166, Sun May 14 03:09:25 2017 UTC

#	Line 27 | Line 27 | public class SystemTest extends JSR166Te
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		}

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