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diff --git a/extern/bullet2/src/LinearMath/TaskScheduler/btThreadSupportInterface.h b/extern/bullet2/src/LinearMath/TaskScheduler/btThreadSupportInterface.h
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+++ b/extern/bullet2/src/LinearMath/TaskScheduler/btThreadSupportInterface.h
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+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2018 Erwin Coumans  http://bulletphysics.com
+
+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.
+*/
+
+#ifndef BT_THREAD_SUPPORT_INTERFACE_H
+#define BT_THREAD_SUPPORT_INTERFACE_H
+
+class btCriticalSection
+{
+public:
+	btCriticalSection() {}
+	virtual ~btCriticalSection() {}
+
+	virtual void lock() = 0;
+	virtual void unlock() = 0;
+};
+
+class btThreadSupportInterface
+{
+public:
+	virtual ~btThreadSupportInterface() {}
+
+	virtual int getNumWorkerThreads() const = 0;            // number of worker threads (total number of logical processors - 1)
+	virtual int getCacheFriendlyNumThreads() const = 0;     // the number of logical processors sharing a single L3 cache
+	virtual int getLogicalToPhysicalCoreRatio() const = 0;  // the number of logical processors per physical processor (usually 1 or 2)
+	virtual void runTask(int threadIndex, void* userData) = 0;
+	virtual void waitForAllTasks() = 0;
+
+	virtual btCriticalSection* createCriticalSection() = 0;
+	virtual void deleteCriticalSection(btCriticalSection* criticalSection) = 0;
+
+	typedef void (*ThreadFunc)(void* userPtr);
+
+	struct ConstructionInfo
+	{
+		ConstructionInfo(const char* uniqueName,
+						 ThreadFunc userThreadFunc,
+						 int threadStackSize = 65535)
+			: m_uniqueName(uniqueName),
+			  m_userThreadFunc(userThreadFunc),
+			  m_threadStackSize(threadStackSize)
+		{
+		}
+
+		const char* m_uniqueName;
+		ThreadFunc m_userThreadFunc;
+		int m_threadStackSize;
+	};
+
+	static btThreadSupportInterface* create(const ConstructionInfo& info);
+};
+
+#endif  //BT_THREAD_SUPPORT_INTERFACE_H