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diff --git a/vcl/inc/schedulerimpl.hxx b/vcl/inc/schedulerimpl.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_VCL_INC_SCHEDULERIMPL_HXX
+#define INCLUDED_VCL_INC_SCHEDULERIMPL_HXX
+
+#include "salwtype.hxx"
+#include <vcl/scheduler.hxx>
+
+class Task;
+
+// Internal scheduler record holding intrusive linked list pieces
+struct ImplSchedulerData final
+{
+    ImplSchedulerData* mpNext;        ///< Pointer to the next element in list
+    Task*              mpTask;        ///< Pointer to VCL Task instance
+    sal_uInt64         mnUpdateTime;  ///< Last Update Time
+    TaskPriority       mePriority;    ///< Task priority
+    /**
+     * Is the Task currently processed / on the stack?
+     *
+     * Since the introduction of the scheduler stack, this became merely a
+     * debugging and assertion hint. No decisions are anymore made based on
+     * this, because invoked Tasks are removed from the scheduler lists and
+     * placed on the stack, so no code should actually ever find one, where
+     * mbInScheduler is true (I don't see a reason to walk the stack for
+     * normal Scheduler usage, that is).
+     *
+     * This was originally used to prevent invoking Tasks recursively.
+     **/
+    bool               mbInScheduler; ///< Task currently processed?
+
+    const char *GetDebugName() const;
+};
+
+class SchedulerGuard final
+{
+public:
+    SchedulerGuard()
+    {
+        Scheduler::Lock();
+    }
+
+    ~SchedulerGuard()
+    {
+        Scheduler::Unlock();
+    }
+};
+
+#endif // INCLUDED_VCL_INC_SCHEDULERIMPL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */