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diff --git a/os_wrappers/CriticalSection.h b/os_wrappers/CriticalSection.h
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+/*
+ * CriticalSection.h
+ *
+ * Copyright (C) ST-Ericsson SA 2011
+ * Authors: Srimanta Panda <srimanta.panda@stericsson.com>,
+ *          Ola Borgelin <ola.borgelin@stericsson.com>,
+ *          Karin Hedlund <karin.hedlund@stericsson.com>,
+ *          Markus Andersson <markus.m.andersson@stericsson.com> for ST-Ericsson.
+ * License terms: 3-clause BSD license
+ *
+ */
+
+/*
+ * @addtogroup OS Wrappers
+ * @{
+ */
+
+#pragma once
+
+#ifndef _WIN32
+#include <pthread.h>
+#endif
+
+/**
+ * @brief Simple wrapper for OS synchronization primitive.
+ *
+ * This class wraps Win32 critical section and POSIX threads mutex.
+ */
+class CriticalSection
+{
+public:
+    /**
+     * @brief Constructor creating new critical section.
+     */
+    CriticalSection();
+
+    /**
+     * @brief Destructor that destroys the critical section.
+     */
+    virtual ~CriticalSection();
+
+    /**
+     * @brief This method enters/locks the critical section.
+     */
+    void enter();
+
+    /**
+     * @brief This method leaves/unlocks the critical section.
+     */
+    void leave();
+private:
+#ifdef _WIN32
+    CRITICAL_SECTION mutex_;
+#else
+    pthread_mutex_t mutex_;
+#endif
+};
+
+/**
+ * @brief RAII class for critical section locking/unlocking.
+ */
+class CSLock
+{
+public:
+    /**
+     * @brief Constructor that enters/locks the passed critical section.
+     *
+     * @param[in] section - critical section to lock.
+     */
+    CSLock(CriticalSection* section);
+
+    /**
+     * @brief Destructor that leaves/unlocks the associated critical section.
+     */
+    virtual ~CSLock();
+private:
+    CriticalSection* section_;
+    CSLock(const CSLock&);
+    CSLock& operator=(const CSLock&);
+};
+
+/* @} */