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diff --git a/include/comphelper/solarmutex.hxx b/include/comphelper/solarmutex.hxx
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+++ b/include/comphelper/solarmutex.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_COMPHELPER_SOLARMUTEX_HXX
+#define INCLUDED_COMPHELPER_SOLARMUTEX_HXX
+
+#include <sal/config.h>
+
+#include <assert.h>
+#include <atomic>
+
+#include <osl/thread.h>
+#include <osl/mutex.hxx>
+#include <comphelper/comphelperdllapi.h>
+
+namespace comphelper {
+
+
+/**
+ * SolarMutex, needed for VCL's Application::GetSolarMutex().
+ *
+ * The SolarMutex is the one big recursive code lock used
+ * to protect the vast majority of the LibreOffice code-base,
+ * in particular anything that is graphical and the cores of
+ * the applications.
+ *
+ * Treat this as a singleton, as its constructor sets a global
+ * pointing at itself.
+ */
+class COMPHELPER_DLLPUBLIC SolarMutex {
+public:
+    typedef void (*BeforeReleaseHandler) ();
+
+    SolarMutex();
+    virtual ~SolarMutex();
+
+    void SetBeforeReleaseHandler( const BeforeReleaseHandler& rLink )
+         { m_aBeforeReleaseHandler = rLink; }
+
+    void acquire( sal_uInt32 nLockCount = 1 );
+    sal_uInt32 release( bool bUnlockAll = false );
+
+    virtual bool tryToAcquire();
+
+    // returns true, if the mutex is owned by the current thread
+    virtual bool IsCurrentThread() const;
+
+    /// Help components to get the SolarMutex easily.
+    static SolarMutex *get();
+
+protected:
+    virtual sal_uInt32 doRelease( bool bUnlockAll );
+    virtual void doAcquire( sal_uInt32 nLockCount );
+
+    osl::Mutex            m_aMutex;
+    sal_uInt32            m_nCount;
+
+private:
+    std::atomic<oslThreadIdentifier> m_nThreadId;
+
+    SolarMutex(const SolarMutex&) = delete;
+    SolarMutex& operator=(const SolarMutex&) = delete;
+
+    BeforeReleaseHandler  m_aBeforeReleaseHandler;
+};
+
+inline void SolarMutex::acquire( sal_uInt32 nLockCount )
+{
+    assert( nLockCount > 0 );
+    doAcquire( nLockCount );
+}
+
+inline sal_uInt32 SolarMutex::release( bool bUnlockAll )
+{
+     return doRelease( bUnlockAll );
+}
+
+}
+
+#endif // INCLUDED_COMPHELPER_SOLARMUTEX_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */