--- jsr166/src/test/tck/AbstractQueuedSynchronizerTest.java	2015/04/25 04:55:30	1.50
+++ jsr166/src/test/tck/AbstractQueuedSynchronizerTest.java	2017/01/01 20:34:39	1.53
@@ -238,26 +238,34 @@ public class AbstractQueuedSynchronizerT
      * default timeout duration).
      */
     void assertAwaitTimesOut(ConditionObject c, AwaitMethod awaitMethod) {
-        long timeoutMillis = timeoutMillis();
-        long startTime = System.nanoTime();
+        final long timeoutMillis = timeoutMillis();
+        final long startTime;
         try {
             switch (awaitMethod) {
             case awaitTimed:
+                startTime = System.nanoTime();
                 assertFalse(c.await(timeoutMillis, MILLISECONDS));
+                assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
                 break;
             case awaitNanos:
+                startTime = System.nanoTime();
                 long nanosTimeout = MILLISECONDS.toNanos(timeoutMillis);
                 long nanosRemaining = c.awaitNanos(nanosTimeout);
                 assertTrue(nanosRemaining <= 0);
+                assertTrue(nanosRemaining > -MILLISECONDS.toNanos(LONG_DELAY_MS));
+                assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
                 break;
             case awaitUntil:
+                // We shouldn't assume that nanoTime and currentTimeMillis
+                // use the same time source, so don't use nanoTime here.
+                java.util.Date delayedDate = delayedDate(timeoutMillis);
                 assertFalse(c.awaitUntil(delayedDate(timeoutMillis)));
+                assertTrue(new java.util.Date().getTime() >= delayedDate.getTime());
                 break;
             default:
                 throw new UnsupportedOperationException();
             }
         } catch (InterruptedException ie) { threadUnexpectedException(ie); }
-        assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
     }
 
     /**