add basic CPU multi threading files from Bullet 2.x (still need to make it work)

btgui/MultiThreading/b3PosixThreadSupport.h

@@ -0,0 +1,147 @@
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2007 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_POSIX_THREAD_SUPPORT_H
+#define BT_POSIX_THREAD_SUPPORT_H
+
+
+#include "LinearMath/btScalar.h"
+#include "PlatformDefinitions.h"
+
+#ifdef USE_PTHREADS //platform specifc defines are defined in PlatformDefinitions.h
+
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 600 //for definition of pthread_barrier_t, see http://pages.cs.wisc.edu/~travitch/pthreads_primer.html
+#endif //_XOPEN_SOURCE
+#include <pthread.h>
+#include <semaphore.h>
+
+
+
+#include "LinearMath/btAlignedObjectArray.h"
+
+#include "btThreadSupportInterface.h"
+
+
+typedef void (*PosixThreadFunc)(void* userPtr,void* lsMemory);
+typedef void* (*PosixlsMemorySetupFunc)();
+
+// PosixThreadSupport helps to initialize/shutdown libspe2, start/stop SPU tasks and communication
+class PosixThreadSupport : public btThreadSupportInterface 
+{
+public:
+    typedef enum sStatus {
+        STATUS_BUSY,
+        STATUS_READY,
+        STATUS_FINISHED
+    } Status;
+
+	// placeholder, until libspe2 support is there
+	struct	btSpuStatus
+	{
+		uint32_t	m_taskId;
+		uint32_t	m_commandId;
+		uint32_t	m_status;
+
+		PosixThreadFunc	m_userThreadFunc;
+		void*	m_userPtr; //for taskDesc etc
+		void*	m_lsMemory; //initialized using PosixLocalStoreMemorySetupFunc
+
+                pthread_t thread;
+                sem_t* startSemaphore;
+
+        unsigned long threadUsed;
+	};
+private:
+
+	btAlignedObjectArray<btSpuStatus>	m_activeSpuStatus;
+public:
+	///Setup and initialize SPU/CELL/Libspe2
+
+	
+
+	struct	ThreadConstructionInfo
+	{
+		ThreadConstructionInfo(const char* uniqueName,
+									PosixThreadFunc userThreadFunc,
+									PosixlsMemorySetupFunc	lsMemoryFunc,
+									int numThreads=1,
+									int threadStackSize=65535
+									)
+									:m_uniqueName(uniqueName),
+									m_userThreadFunc(userThreadFunc),
+									m_lsMemoryFunc(lsMemoryFunc),
+									m_numThreads(numThreads),
+									m_threadStackSize(threadStackSize)
+		{
+
+		}
+
+		const char*					m_uniqueName;
+		PosixThreadFunc			m_userThreadFunc;
+		PosixlsMemorySetupFunc	m_lsMemoryFunc;
+		int						m_numThreads;
+		int						m_threadStackSize;
+
+	};
+
+	PosixThreadSupport(ThreadConstructionInfo& threadConstructionInfo);
+
+///cleanup/shutdown Libspe2
+	virtual	~PosixThreadSupport();
+
+	void	startThreads(ThreadConstructionInfo&	threadInfo);
+
+
+///send messages to SPUs
+	virtual	void sendRequest(uint32_t uiCommand, ppu_address_t uiArgument0, uint32_t uiArgument1);
+
+///check for messages from SPUs
+	virtual	void waitForResponse(unsigned int *puiArgument0, unsigned int *puiArgument1);
+
+///start the spus (can be called at the beginning of each frame, to make sure that the right SPU program is loaded)
+	virtual	void startSPU();
+
+///tell the task scheduler we are done with the SPU tasks
+	virtual	void stopSPU();
+
+	virtual void setNumTasks(int numTasks) {}
+
+	virtual int getNumTasks() const
+	{
+		return m_activeSpuStatus.size();
+	}
+
+	virtual btBarrier* createBarrier();
+
+	virtual btCriticalSection* createCriticalSection();
+
+	virtual void deleteBarrier(btBarrier* barrier);
+
+	virtual void deleteCriticalSection(btCriticalSection* criticalSection);
+	
+	
+	virtual void*	getThreadLocalMemory(int taskId)
+	{
+		return m_activeSpuStatus[taskId].m_lsMemory;
+	}
+
+};
+
+#endif // USE_PTHREADS
+
+#endif // BT_POSIX_THREAD_SUPPORT_H
+
+