--- /dev/null	2016-03-28 14:07:52.007986692 +0200
+++ new/src/java.base/share/classes/jdk/internal/ref/ExtendedCleaner.java	2016-03-28 16:44:48.776040707 +0200
@@ -0,0 +1,42 @@
+package jdk.internal.ref;
+
+import java.lang.ref.Cleaner;
+import java.util.Objects;
+import java.util.concurrent.ThreadFactory;
+import java.util.function.BooleanSupplier;
+
+/**
+ * An extension of public {@link Cleaner} with operations that can only be
+ * invoked from within {@code java.base} module or selected modules to
+ * which {@code jdk.internal.ref} package is exported.
+ */
+public interface ExtendedCleaner extends Cleaner {
+
+    /**
+     * @return new ExtendedCleaner with default ThreadFactory.
+     */
+    static ExtendedCleaner create() {
+        return new CleanerImpl.ExtendedImpl(null);
+    }
+
+    /**
+     * @return new ExtendedCleaner with given ThreadFactory.
+     */
+    static ExtendedCleaner create(ThreadFactory threadFactory) {
+        Objects.requireNonNull(threadFactory, "threadFactory");
+        return new CleanerImpl.ExtendedImpl(threadFactory);
+    }
+
+    /**
+     * Retries given {@code retriableOperation} while helping execute cleaning
+     * functions of pending Cleanable(s) registered by this ExtendedCleaner
+     * until the operation returns {@code true} or there are no more pending
+     * Cleanable(s) to clean.
+     *
+     * @param retriableOperation the operation to retry while helping with cleanup.
+     * @return {@code true} if the operation succeeded by returning {@code true} or
+     * {@code false} when the operation did not succeed before all pending
+     * Cleanable(s) have been executed.
+     */
+    boolean retryWhileHelpingClean(BooleanSupplier retriableOperation);
+}