/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
/* If you are missing that file, acquire a complete release at teeworlds.com.                */
#ifndef ENGINE_SHARED_JOBS_H
#define ENGINE_SHARED_JOBS_H
class CJob;
class CJobPool;

typedef int (*JOBFUNC)(void *pData);
typedef void (*CBFUNC)(CJob *pJob, void *pData);

class CJob
{
	friend class CJobPool;

	CJob *m_pPrev;
	CJob *m_pNext;

	volatile int m_Status;
	volatile int m_Result;

	JOBFUNC m_pfnFunc;
	CBFUNC m_pfnDestroy;
	void *m_pFuncData;
public:
	CJob()
	{
		m_Status = STATE_DONE;
		m_pFuncData = 0;
	}

	enum
	{
		STATE_PENDING=0,
		STATE_RUNNING,
		STATE_DONE
	};

	int Status() const { return m_Status; }
	int Result() const { return m_Result; }
};

class CJobPool
{
	enum
	{
		MAX_THREADS=32
	};
	int m_NumThreads;
	void *m_apThreads[MAX_THREADS];
	volatile bool m_Shutdown;

	LOCK m_Lock;
	SEMAPHORE m_Semaphore;
	CJob *m_pFirstJob;
	CJob *m_pLastJob;

	static void WorkerThread(void *pUser);

public:
	CJobPool();
	~CJobPool();

	int Init(int NumThreads);
	int Add(CJob *pJob, JOBFUNC pfnFunc, void *pData, CBFUNC pfnDestroy = 0);
};
#endif