#ifndef __MAS_MEMPOOL_H
#define __MAS_MEMPOOL_H

#include "Types.h"
#include "Locks.h"
#include "MAS_Definition.h"

NAMESPACE_MAS_BEGIN

#define MEMPOOL MemPool::Instance()

class MemPool {

public:
	static MemPool * Instance();
	static void DestroyInstance();

	TZ_INT Initialize();
	TZ_INT Dispose();

	// return nullptr when failed
	void * AllocAvailMem(TZ_Uint32 expect);

	TZ_INT ReturnFreeMem(void * memBlock, TZ_Uint32 memSize);

	TZ_Uint32 GetAvailCount(TZ_Uint32 expect);

private:
	MemPool();
	~MemPool();

private:
	tzc::Mutex m_lock;

	std::vector<std::list<void *>> m_memDepot;
	
	const TZ_Uint32 MIN_BLOCK_SIZE = 4096;
	const TZ_Uint32 BLOCK_LIST_COUNT = 16;

	static tzc::Mutex _mutex;
	static MemPool * _instance;
};

NAMESPACE_MAS_END

#endif