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diff --git a/include/vcl/scheduler.hxx b/include/vcl/scheduler.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_SCHEDULER_HXX
+#define INCLUDED_VCL_SCHEDULER_HXX
+
+#include <vcl/dllapi.h>
+
+struct ImplSchedulerContext;
+
+class VCL_DLLPUBLIC Scheduler final
+{
+    friend class SchedulerGuard;
+    friend class Task;
+    Scheduler() = delete;
+
+    static inline void UpdateSystemTimer( ImplSchedulerContext &rSchedCtx,
+                                          sal_uInt64 nMinPeriod,
+                                          bool bForce, sal_uInt64 nTime );
+
+    static void ImplStartTimer ( sal_uInt64 nMS, bool bForce, sal_uInt64 nTime );
+
+    static void Lock();
+    static void Unlock();
+
+public:
+    static constexpr sal_uInt64 ImmediateTimeoutMs = 0;
+    static constexpr sal_uInt64 InfiniteTimeoutMs  = SAL_MAX_UINT64;
+
+    static void       ImplDeInitScheduler();
+
+    /**
+     * System timer callback function, which processes one LO task
+     *
+     * Will restart the system timer, so it will process further tasks at the right time.
+     **/
+    static void CallbackTaskScheduling();
+
+    /**
+     * Process all events until none is pending
+     *
+     * This can busy-lock, if some task or system event always generates new
+     * events when being processed. Most time it's called in unit tests to
+     * process all pending events. Internally it just calls
+     * Application::Reschedule( true ) until it fails.
+     *
+     * @see Application::Reschedule
+     */
+    static void       ProcessEventsToIdle();
+
+    /**
+     * Wakes up the scheduler
+     *
+     * This doesn't handle any events! It just ensures the Scheduler is run as
+     * soon as possible by forcing the Scheduler timer to fire.
+     *
+     * Can be used for complex UpdateMinPeriod function, where the task is
+     * actually active but not ready and we want to skip the Task::Start()
+     * queue append for faster reaction.
+     */
+    static void       Wakeup();
+
+    /// Control the deterministic mode.  In this mode, two subsequent runs of
+    /// LibreOffice fire about the same amount idles.
+    static void       SetDeterministicMode(bool bDeterministic);
+    /// Return the current state of deterministic mode.
+    static bool       GetDeterministicMode();
+};
+
+#endif // INCLUDED_VCL_SCHEDULER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */