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diff --git a/src/libstrongswan/threading/mutex.h b/src/libstrongswan/threading/mutex.h
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+++ b/src/libstrongswan/threading/mutex.h
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+/*
+ * Copyright (C) 2008-2009 Tobias Brunner
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup mutex mutex
+ * @{ @ingroup threading
+ */
+
+#ifndef THREADING_MUTEX_H_
+#define THREADING_MUTEX_H_
+
+typedef struct mutex_t mutex_t;
+typedef enum mutex_type_t mutex_type_t;
+
+/**
+ * Type of mutex.
+ */
+enum mutex_type_t {
+	/** default mutex */
+	MUTEX_TYPE_DEFAULT	= 0,
+	/** allow recursive locking of the mutex */
+	MUTEX_TYPE_RECURSIVE	= 1,
+};
+
+/**
+ * Mutex wrapper implements simple, portable and advanced mutex functions.
+ */
+struct mutex_t {
+
+	/**
+	 * Acquire the lock to the mutex.
+	 */
+	void (*lock)(mutex_t *this);
+
+	/**
+	 * Release the lock on the mutex.
+	 */
+	void (*unlock)(mutex_t *this);
+
+	/**
+	 * Destroy a mutex instance.
+	 */
+	void (*destroy)(mutex_t *this);
+};
+
+/**
+ * Create a mutex instance.
+ *
+ * @param type		type of mutex to create
+ * @return			unlocked mutex instance
+ */
+mutex_t *mutex_create(mutex_type_t type);
+
+#endif /** THREADING_MUTEX_H_ @} */
+