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diff --git a/extern/bullet2/BulletMultiThreaded/SpuSync.h b/extern/bullet2/BulletMultiThreaded/SpuSync.h
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+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2007 Starbreeze Studios
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+
+Written by: Marten Svanfeldt
+*/
+
+#ifndef SPU_SYNC_H
+#define	SPU_SYNC_H
+
+
+#include "PlatformDefinitions.h"
+
+
+#if defined(WIN32)
+
+#define WIN32_LEAN_AND_MEAN
+#ifdef _XBOX
+#include <Xtl.h>
+#else
+#include <Windows.h>
+#endif
+
+///The btSpinlock is a structure to allow multi-platform synchronization. This allows to port the SPU tasks to other platforms.
+class btSpinlock
+{
+public:
+	//typedef volatile LONG SpinVariable;
+	typedef CRITICAL_SECTION SpinVariable;
+
+	btSpinlock (SpinVariable* var)
+		: spinVariable (var)
+	{}
+
+	void Init ()
+	{
+		//*spinVariable = 0;
+		InitializeCriticalSection(spinVariable);
+	}
+
+	void Lock ()
+	{
+		EnterCriticalSection(spinVariable);
+	}
+
+	void Unlock ()
+	{
+		LeaveCriticalSection(spinVariable);
+	}
+
+private:
+	SpinVariable* spinVariable;
+};
+
+
+#elif defined (__CELLOS_LV2__)
+
+//#include <cell/atomic.h>
+#include <cell/sync/mutex.h>
+
+///The btSpinlock is a structure to allow multi-platform synchronization. This allows to port the SPU tasks to other platforms.
+class btSpinlock
+{
+public:
+	typedef CellSyncMutex SpinVariable;
+
+	btSpinlock (SpinVariable* var)
+		: spinVariable (var)
+	{}
+
+	void Init ()
+	{
+#ifndef __SPU__
+		//*spinVariable = 1;
+		cellSyncMutexInitialize(spinVariable);
+#endif
+	}
+
+
+
+	void Lock ()
+	{
+#ifdef __SPU__
+		// lock semaphore
+		/*while (cellAtomicTestAndDecr32(atomic_buf, (uint64_t)spinVariable) == 0) 
+		{
+
+		};*/
+		cellSyncMutexLock((uint64_t)spinVariable);
+#endif
+	}
+
+	void Unlock ()
+	{
+#ifdef __SPU__
+		//cellAtomicIncr32(atomic_buf, (uint64_t)spinVariable);
+		cellSyncMutexUnlock((uint64_t)spinVariable);
+#endif 
+	}
+
+
+private:
+	SpinVariable*	spinVariable;
+	ATTRIBUTE_ALIGNED128(uint32_t		atomic_buf[32]);
+};
+
+#else
+//create a dummy implementation (without any locking) useful for serial processing
+class btSpinlock
+{
+public:
+	typedef int  SpinVariable;
+
+	btSpinlock (SpinVariable* var)
+		: spinVariable (var)
+	{}
+
+	void Init ()
+	{
+	}
+
+	void Lock ()
+	{
+	}
+
+	void Unlock ()
+	{
+	}
+
+private:
+	SpinVariable* spinVariable;
+};
+
+
+#endif
+
+
+#endif