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diff --git a/include/osl/interlck.h b/include/osl/interlck.h
new file mode 100644
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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 .
+ */
+
+/*
+ * This file is part of LibreOffice published API.
+ */
+
+#ifndef INCLUDED_OSL_INTERLCK_H
+#define INCLUDED_OSL_INTERLCK_H
+
+#include "sal/config.h"
+
+#include "sal/saldllapi.h"
+#include "sal/types.h"
+
+#if defined(_WIN32)
+#include <intrin.h>
+#endif
+
+#if defined LIBO_INTERNAL_ONLY
+#include "config_global.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef sal_Int32 oslInterlockedCount;
+
+/** Increments the count variable addressed by pCount.
+    @param pCount Address of count variable
+    @return The adjusted value of the count variable.
+*/
+SAL_DLLPUBLIC oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount);
+
+/** Decrement the count variable addressed by pCount.
+    @param pCount Address of count variable
+    @return The adjusted value of the count variable.
+*/
+SAL_DLLPUBLIC oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount);
+
+
+/// @cond INTERNAL
+
+/** Increments the count variable addressed by p.
+
+    @attention This functionality should only be used internally within
+    LibreOffice.
+
+    @param p Address of count variable
+    @return The adjusted value of the count variable.
+
+    @since LibreOffice 4.0
+*/
+#if HAVE_GCC_BUILTIN_ATOMIC
+#    define osl_atomic_increment(p)  __sync_add_and_fetch((p), 1)
+#elif defined _WIN32
+#    define osl_atomic_increment(p)  _InterlockedIncrement(p)
+#else
+#    define osl_atomic_increment(p) osl_incrementInterlockedCount((p))
+#endif
+
+
+/** Decrement the count variable addressed by p.
+
+    @attention This functionality should only be used internally within
+    LibreOffice.
+
+    @param p Address of count variable
+    @return The adjusted value of the count variable.
+
+    @since LibreOffice 4.0
+*/
+#if HAVE_GCC_BUILTIN_ATOMIC
+#    define osl_atomic_decrement(p) __sync_sub_and_fetch((p), 1)
+#elif defined _WIN32
+#    define osl_atomic_decrement(p)  _InterlockedDecrement(p)
+#else
+#    define osl_atomic_decrement(p) osl_decrementInterlockedCount((p))
+#endif
+
+/// @endcond
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif // INCLUDED_OSL_INTERLCK_H
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */