游戏服务器之配置内存管理

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使用通用对象分配器来实现内存管理分配器，并可在程序结束时自动回收。

模板分配器基类

/*通用对象分配器，可一次分配多个*/template <typename T>class CBaseObjAllocator {public://内存块描述结构，用于查询内存块信息struct DataBlockDesc{const char* lpBaseAddress;//内存块指针地址size_t dwBlockSize; //内存块大小};private://内存块链表节点struct DataBlock{T* pFreePtr;//指向空闲的对象T* pEndPtr;//指向对象内存块的结束DataBlock* pPrev;}*m_pDataBlock;public:enum {AllocObjectCountOneTime = 1024;//每次申请内存大小};T* allocObject(){return allocObjects(1);}//申请属性指针T* allocObjects(const INT_PTR nCount = 1){T* result;DataBlock *pBlock = m_pDataBlock;//尝试从当前内存块中申请nCount的对象，如果内存块中没有足够的对象，则向之前的内存块中查找是否具有足够的空闲对象if ( !pBlock || pBlock->pEndPtr - pBlock->pFreePtr < nCount ){//向之前的内存块中查找是否具有足够的空闲对象while (pBlock && (pBlock = pBlock->pPrev)){if ( pBlock->pEndPtr - pBlock->pFreePtr >= nCount )break;}//如果所有内存块中都没有足够的对象则申请新内存块if ( pBlock == NULL ){INT_PTR nAllocCount = __max(nCount, AllocObjectCountOneTime);//最小1024字节pBlock = (DataBlock*)malloc(sizeof(DataBlock) + sizeof(T) * nAllocCount);memset(pBlock, 0, sizeof(DataBlock) + sizeof(T) * nAllocCount);pBlock->pFreePtr = (T*)(pBlock + 1);//跳过块头pBlock->pEndPtr = pBlock->pFreePtr + nAllocCount;//块内存结尾pBlock->pPrev = m_pDataBlock;//插入新块到链表的头部m_pDataBlock = pBlock;}}//返回对象指针result = pBlock->pFreePtr;//返回满足需求的内存地址pBlock->pFreePtr += nCount;return result;}//获取内存块数量inline INT_PTR blockCount() const{INT_PTR result = 0;DataBlock *pBlock = m_pDataBlock;while (pBlock){result++;pBlock = pBlock->pPrev;}return result;}CBaseObjAllocator(){m_pDataBlock = NULL;}~CBaseObjAllocator()//对象分配器的内存是在析构时回收的{DataBlock *pBlock, *pPrev;//释放内存块链表pBlock = m_pDataBlock;while (pBlock){pPrev = pBlock->pPrev;free(pBlock);pBlock = pPrev;}m_pDataBlock = NULL;}};

加载配置使用的内存分配器。因为内存分配器的内存是在析构时回收的，所以不需要手动回收内存。

class CConfigAllocator : public CBaseObjAllocator<char>{public:typedef CBaseObjAllocator<char> super;//内存分配器的单位是1字节public:template<typename T>inline T* Alloc(size_t count)//分配{size_t sz = sizeof(T) * count;return (T*)super::allocObjects(sz);}inline char* AllocStr(const std::string& str){size_t len = str.length();size_t sz = (len + 1) * sizeof(char);char *result = (char*)super::allocObjects(sz);memcpy(result, str.c_str(), len * sizeof(char));//拷贝string的内容到分配的内存里result[len] = 0;//结束符return result;}};

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