Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11971#discussion_r57521413
--- Diff:
core/src/main/scala/org/apache/spark/util/UninterruptibleThread.scala ---
@@ -0,0 +1,106 @@
+/*
+ * 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 javax.annotation.concurrent.GuardedBy
+
+/**
+ * A special Thread that provides "runUninterruptibly" to allow running
codes without being
+ * interrupted by `Thread.interrupt()`. If `Thread.interrupt()` is called
during runUninterruptibly
+ * is running, it won't set the interrupted status. Instead, setting the
interrupted status will be
+ * deferred until it's returning from "runUninterruptibly".
+ *
+ * Note: this method should be called only in `this` thread.
+ */
+private[spark] class UninterruptibleThread(name: String) extends
Thread(name) {
+
+ /** A monitor to protect "uninterruptible" and "interrupted" */
+ private val uninterruptibleLock = new Object
+
+ /**
+ * Indicates if `this` thread are in the uninterruptible status. If so,
interrupting
+ * "this" will be deferred until `this` enters into the interruptible
status.
+ */
+ @GuardedBy("uninterruptibleLock")
+ private var uninterruptible = false
+
+ /**
+ * Indicates if we should interrupt `this` when we are leaving the
uninterruptible zone.
+ */
+ @GuardedBy("uninterruptibleLock")
+ private var shouldInterruptThread = false
+
+ /**
+ * Run `f` uninterruptibly in `this` thread. The thread won't be
interrupted before returning
+ * from `f`.
+ *
+ * Note: this method should be called only in `this` thread.
+ */
+ def runUninterruptibly[T](f: => T): T = {
+ if (Thread.currentThread() != this) {
+ throw new IllegalStateException(s"Call runUninterruptibly in a wrong
thread. " +
+ s"Expected: $this but was ${Thread.currentThread()}")
+ }
+
--- End diff --
minor: should you bail out early if `shouldInterruptThread` has already
been set somehow?
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