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diff --git a/src/foundation/Qt3DSSemaphore.h b/src/foundation/Qt3DSSemaphore.h
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+/****************************************************************************
+**
+** Copyright (C) 2008-2012 NVIDIA Corporation.
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QT3DS_FOUNDATION_PSSEMAPHORE_H
+#define QT3DS_FOUNDATION_PSSEMAPHORE_H
+
+#include "foundation/Qt3DS.h"
+#include "foundation/Qt3DSAllocatorCallback.h"
+
+namespace qt3ds {
+namespace foundation {
+    class QT3DS_FOUNDATION_API Semaphore
+    {
+    public:
+        static const QT3DSU32 waitForever = 0xffffffff;
+
+        Semaphore(NVAllocatorCallback &alloc, QT3DSU32 initialCount, QT3DSU32 maxCount);
+
+        ~Semaphore();
+
+        /**Decrements (locks) the semaphore. If the semaphore's value is greater than zero,
+        *  then the decrement proceeds, and the function returns, immediately. Otherwise
+        *  Wait for at most the given number of ms. Returns true if the Semaphore is signaled.
+        *  Semaphore::waitForever will block forever or until the semaphore is signaled.
+        */
+
+        bool wait(QT3DSU32 milliseconds = waitForever);
+
+        /** increments (unlocks) the semaphore */
+
+        void post();
+
+    private:
+        class SemaphoreImpl *mImpl;
+    };
+
+} // namespace foundation
+} // namespace qt3ds
+
+#endif