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diff --git a/sw/source/core/inc/swthreadmanager.hxx b/sw/source/core/inc/swthreadmanager.hxx
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+++ b/sw/source/core/inc/swthreadmanager.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_SW_SOURCE_CORE_INC_SWTHREADMANAGER_HXX
+#define INCLUDED_SW_SOURCE_CORE_INC_SWTHREADMANAGER_HXX
+
+#include <osl/interlck.h>
+
+#include <memory>
+
+namespace rtl { template <class reference_type> class Reference; }
+
+class ObservableThread;
+class ThreadManager;
+
+/** class to manage threads in Writer using a <ThreadManager> instance
+
+    #i73788#
+    Conforms the singleton pattern
+*/
+class SwThreadManager
+{
+    public:
+
+        static SwThreadManager& GetThreadManager();
+
+        static bool ExistsThreadManager();
+
+        // private: don't call!
+        SwThreadManager();
+        // private: don't call!
+        ~SwThreadManager();
+
+        oslInterlockedCount AddThread( const rtl::Reference< ObservableThread >& rThread );
+
+        void RemoveThread( const oslInterlockedCount nThreadID );
+
+        /** suspend the starting of threads
+
+            Suspending the starting of further threads is sensible during the
+            destruction of a Writer document.
+        */
+        void SuspendStartingOfThreads();
+
+        /** continues the starting of threads after it has been suspended
+        */
+        void ResumeStartingOfThreads();
+
+        bool StartingOfThreadsSuspended();
+
+    private:
+
+        SwThreadManager(SwThreadManager const&) = delete;
+        SwThreadManager& operator=(SwThreadManager const&) = delete;
+
+        static bool mbThreadManagerInstantiated;
+
+        std::unique_ptr<ThreadManager> mpThreadManagerImpl;
+
+};
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */