Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/13718#discussion_r67736286
--- Diff: core/src/main/scala/org/apache/spark/util/ManualClock.scala ---
@@ -57,9 +59,19 @@ private[spark] class ManualClock(private var time: Long)
extends Clock {
* @return current time reported by the clock when waiting finishes
*/
def waitTillTime(targetTime: Long): Long = synchronized {
- while (time < targetTime) {
- wait(10)
+ _isWaiting = true
+ try {
+ while (time < targetTime) {
+ wait(10)
+ }
+ getTimeMillis()
+ } finally {
+ _isWaiting = false
}
- getTimeMillis()
}
+
+ /**
+ * Returns whether there is any thread being blocked in `waitTillTime`.
+ */
+ def isWaiting: Boolean = synchronized { _isWaiting }
--- End diff --
So `isWaiting` returns true only when some threads is blocked by `wait(10)`.
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