--- /dev/null	2019-06-28 15:24:44.000000000 -0700
+++ new/src/hotspot/share/services/threadTable.hpp	2019-06-28 15:24:44.000000000 -0700
@@ -0,0 +1,63 @@
+
+/*
+* 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_SERVICES_THREADTABLE_HPP
+#define SHARE_SERVICES_THREADTABLE_HPP
+
+#include "memory/allocation.hpp"
+
+class JavaThread;
+class ThreadTableConfig;
+
+class ThreadTable : public AllStatic {
+  static volatile bool _has_work;
+
+ public:
+   // Initialization
+   static void create_table();
+
+   static size_t table_size();
+
+   // Lookup and inserts
+   static JavaThread* find_thread(jlong tid);
+   static JavaThread* add_thread(jlong tid, JavaThread* thread);
+   static bool remove_thread(jlong tid);
+
+   // Callbacks
+   static void item_added();
+   static void item_removed();
+
+   // Growing
+   static bool has_work() { return _has_work; }
+
+   static void check_concurrent_work();
+   static void trigger_concurrent_work();
+   static void do_concurrent_work(JavaThread* jt);
+
+   static double get_load_factor();
+   static void grow(JavaThread* jt);
+};
+
+#endif // SHARE_SERVICES_THREADTABLE_HPP