--- a/src/java.base/share/classes/sun/nio/ch/SelectionKeyImpl.java	Wed Nov 20 09:12:07 2019 +0100
+++ b/src/java.base/share/classes/sun/nio/ch/SelectionKeyImpl.java	Wed Nov 20 08:35:53 2019 +0000
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -58,6 +58,9 @@
     // registered events in kernel, used by some Selector implementations
     private int registeredEvents;
 
+    // registered events need to be reset, used by some Selector implementations
+    private volatile boolean reset;
+
     // index of key in pollfd array, used by some Selector implementations
     private int index;
 
@@ -184,6 +187,26 @@
         index = i;
     }
 
+    /**
+     * Sets the reset flag, re-queues the key, and wakeups up the Selector
+     */
+    void reset() {
+        reset = true;
+        selector.setEventOps(this);
+        selector.wakeup();
+    }
+
+    /**
+     * Clears the reset flag, returning the previous value of the flag
+     */
+    boolean getAndClearReset() {
+        assert Thread.holdsLock(selector);
+        boolean r = reset;
+        if (r)
+            reset = false;
+        return r;
+    }
+
     @Override
     public String toString() {
         StringBuilder sb = new StringBuilder();