--- /dev/null	2019-02-14 11:31:37.500399000 +0100
+++ new/src/hotspot/share/gc/z/zNMethodTableIteration.hpp	2019-02-21 09:29:29.483057715 +0100
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#ifndef SHARE_GC_Z_ZNMETHODTABLEITERATION_HPP
+#define SHARE_GC_Z_ZNMETHODTABLEITERATION_HPP
+
+#include "gc/z/zGlobals.hpp"
+
+class ZNMethodClosure;
+class ZNMethodTableEntry;
+
+class ZNMethodTableIteration {
+private:
+  ZNMethodTableEntry* _table;
+  size_t              _size;
+  volatile size_t     _claimed ATTRIBUTE_ALIGNED(ZCacheLineSize);
+
+public:
+  ZNMethodTableIteration();
+
+  bool in_progress() const;
+
+  void nmethods_do_begin(ZNMethodTableEntry* table, size_t size);
+  void nmethods_do_end();
+  void nmethods_do(ZNMethodClosure* cl);
+};
+
+#endif // SHARE_GC_Z_ZNMETHODTABLEITERATION_HPP