diff --git a/src/hotspot/share/gc/parallel/psRootType.inline.hpp b/src/hotspot/share/gc/parallel/psRootType.inline.hpp
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+/*
+ * 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_PARALLEL_PSROOTTYPE_INLINE_HPP
+#define SHARE_GC_PARALLEL_PSROOTTYPE_INLINE_HPP
+
+#include "memory/allocation.hpp"
+#include "runtime/atomic.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+namespace Parallel { namespace RootType {
+  enum Value {
+    universe,
+    jni_handles,
+    //"threads" are handled in parallel as a special case
+    object_synchronizer,
+    system_dictionary,
+    class_loader_data,
+    management,
+    jvmti,
+    code_cache,
+    JVMCI_ONLY(jvmci COMMA)
+    sentinel
+  };
+}} // namespace Parallel::RootType
+
+template <typename T>
+class EnumClaimer : StackObj {
+  volatile uint _counter;
+  uint _to_exclusive;
+public:
+  EnumClaimer(T to_exclusive) : _counter(0), _to_exclusive(to_exclusive) {
+    STATIC_ASSERT(sizeof(T) <= sizeof _counter);
+    assert(_to_exclusive <= 20, "arbitrary (please change if needed), but we want to guard against /sparse/ bit-field like enumerations");
+  }
+  ~EnumClaimer() {
+    assert(_counter >= _to_exclusive, "not all enumerations were claimed");
+  }
+
+  bool try_claim(T& enum_reference) {
+    uint claimed = Atomic::add(1u, &_counter) - 1; // -1 is so that we start with zero
+    if (claimed < _to_exclusive) {
+      enum_reference = reinterpret_cast<T&>(claimed);
+      return true;
+    } else {
+      return false;
+    }
+  }
+};
+
+#endif /* SHARE_GC_PARALLEL_PSROOTTYPE_INLINE_HPP */