Github user aarondav commented on a diff in the pull request: https://github.com/apache/spark/pull/4016#discussion_r22922444 --- Diff: core/src/test/scala/org/apache/spark/util/EventLoopSuite.scala --- @@ -0,0 +1,83 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.spark.util + +import java.util.concurrent.atomic.AtomicReference + +import scala.collection.mutable +import scala.concurrent.duration._ +import scala.language.postfixOps + +import org.scalatest.concurrent.Eventually._ +import org.scalatest.FunSuite + +class EventLoopSuite extends FunSuite { --- End diff -- Right, I mean make sure that the event loop is eventually stopped despite stop() being called while the onReceive() was doing a busy-wait of clearing the interrupted flag, or calling an uninterruptible wait on a lock. However, it may be overly much trouble to set up such a condition and the new boolean flag probably works :)
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