Automatic sources dropoff on 2020-06-10 18:32:38.095721
The change is generated with prebuilt drop tool.
Change-Id: I24cbf6ba6db262a1ae1445db1427a08fee35b3b4
diff --git a/jsr166/SystemTest.java b/jsr166/SystemTest.java
new file mode 100644
index 0000000..412ce17
--- /dev/null
+++ b/jsr166/SystemTest.java
@@ -0,0 +1,73 @@
+/*
+ * Written by Doug Lea with assistance from members of JCP JSR-166
+ * Expert Group and released to the public domain, as explained at
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ * Other contributors include Andrew Wright, Jeffrey Hayes,
+ * Pat Fisher, Mike Judd.
+ */
+
+package jsr166;
+
+import junit.framework.Test;
+import junit.framework.TestSuite;
+
+public class SystemTest extends JSR166TestCase {
+ // android-note: Removed because the CTS runner does a bad job of
+ // retrying tests that have suite() declarations.
+ //
+ // public static void main(String[] args) {
+ // main(suite(), args);
+ // }
+ // public static Test suite() {
+ // return new TestSuite(SystemTest.class);
+ // }
+
+ /**
+ * Worst case rounding for millisecs; set for 60 cycle millis clock.
+ * This value might need to be changed on JVMs with coarser
+ * System.currentTimeMillis clocks.
+ */
+ static final long MILLIS_ROUND = 17;
+
+ /**
+ * Nanos between readings of millis is no longer than millis (plus
+ * possible rounding).
+ * This shows only that nano timing not (much) worse than milli.
+ */
+ public void testNanoTime1() throws InterruptedException {
+ long m1 = System.currentTimeMillis();
+ Thread.sleep(1);
+ long n1 = System.nanoTime();
+ Thread.sleep(SHORT_DELAY_MS);
+ long n2 = System.nanoTime();
+ Thread.sleep(1);
+ long m2 = System.currentTimeMillis();
+ long millis = m2 - m1;
+ long nanos = n2 - n1;
+ assertTrue(nanos >= 0);
+ long nanosAsMillis = nanos / 1000000;
+ assertTrue(nanosAsMillis <= millis + MILLIS_ROUND);
+ }
+
+ /**
+ * Millis between readings of nanos is less than nanos, adjusting
+ * for rounding.
+ * This shows only that nano timing not (much) worse than milli.
+ */
+ public void testNanoTime2() throws InterruptedException {
+ long n1 = System.nanoTime();
+ Thread.sleep(1);
+ long m1 = System.currentTimeMillis();
+ Thread.sleep(SHORT_DELAY_MS);
+ long m2 = System.currentTimeMillis();
+ Thread.sleep(1);
+ long n2 = System.nanoTime();
+ long millis = m2 - m1;
+ long nanos = n2 - n1;
+
+ assertTrue(nanos >= 0);
+ long nanosAsMillis = nanos / 1000000;
+ assertTrue(millis <= nanosAsMillis + MILLIS_ROUND);
+ }
+
+}
