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diff --git a/thirdparty/bullet/LinearMath/TaskScheduler/btThreadSupportInterface.h b/thirdparty/bullet/LinearMath/TaskScheduler/btThreadSupportInterface.h
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+++ b/thirdparty/bullet/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
+