src/java.base/aix/classes/sun/nio/ch/DefaultPollerProvider.java

@@ -28,17 +28,30 @@
  
  /**
   * Default PollerProvider for AIX.
   */
  class DefaultPollerProvider extends PollerProvider {
-     DefaultPollerProvider() { }
+     DefaultPollerProvider(Poller.Mode mode) {
+         if (mode != Poller.Mode.SYSTEM_THREADS) {
+             throw new UnsupportedOperationException();
+         }
+         super(mode);
+     }
+ 
+     DefaultPollerProvider() {
+         this(Poller.Mode.SYSTEM_THREADS);
+     }
  
      @Override
      Poller readPoller(boolean subPoller) throws IOException {
+         if (subPoller)
+             throw new UnsupportedOperationException();
          return new PollsetPoller(true);
      }
  
      @Override
      Poller writePoller(boolean subPoller) throws IOException {
+         if (subPoller)
+             throw new UnsupportedOperationException();
          return new PollsetPoller(false);
      }
  }