GODOT IS OPEN SOURCE

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diff --git a/core/os/mutex.h b/core/os/mutex.h
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+/*************************************************************************/
+/*  mutex.h                                                              */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                    http://www.godotengine.org                         */
+/*************************************************************************/
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                 */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+#ifndef MUTEX_H
+#define MUTEX_H
+
+#include "error_list.h"
+
+
+/**
+ * @class Mutex 
+ * @author Juan Linietsky
+ * Portable Mutex (thread-safe locking) implementation.
+ * Mutexes are always recursive ( they don't self-lock in a single thread ).
+ * Mutexes can be used with a Lockp object like this, to avoid having to worry about unlocking:
+ * Lockp( mutex );
+ */
+
+
+class Mutex {
+protected:	
+	static Mutex* (*create_func)(bool);
+	
+public:
+
+	virtual void lock()=0; ///< Lock the mutex, block if locked by someone else
+	virtual void unlock()=0; ///< Unlock the mutex, let other threads continue
+	virtual Error try_lock()=0; ///< Attempt to lock the mutex, true on success, false means it can't lock.
+
+	static Mutex * create(bool p_recursive=true); ///< Create a mutex
+	
+	virtual ~Mutex();
+};
+
+class MutexLock {
+
+	Mutex *mutex;
+public:
+
+	MutexLock(Mutex* p_mutex) { mutex=p_mutex; if (mutex) mutex->lock(); }
+	~MutexLock() { if (mutex) mutex->unlock(); }
+
+};
+
+#endif