/**
 * Copyright (c) Huawei Technologies Co., Ltd. 2023. All rights reserved.
 * 内部基础模块，所有参数合法性由调用者保证
 */
#ifndef MEM_POOL_H_
#define MEM_POOL_H_
#include <stdio.h>
#include "single_list.h"
#include "mmpa_api.h"
#ifdef __cplusplus
extern "C" {
#endif

#define MEM_POOL_NODE_SEQ_BITNUM 32
#define MEM_POOL_NODE_IDLE_FLAG 0xCADAEA00UL
#define MEM_POOL_NODE_USED_FLAG 0xCADAEA01UL

typedef struct {
    CSingleList idleList;
    size_t memSize;
    mmAtomicType64 updating;
    uint32_t seq;
} MemPool;

typedef struct {
    mmAtomicType64 flag;
    CSingleListNode node;
    uint8_t data[0];
} MemNode;

#define MEM_POOL_INIT(memSize) {CSINGLE_LIST_INIT, (memSize), 0, 0}
void InitMemPool(MemPool *pool, size_t memSize);
void DeInitMemPool(MemPool *pool);
void* MemPoolAlloc(MemPool *pool);
void MemPoolFree(MemPool *pool, void *mem, FnDestroy pfnDestroy);

static inline bool MemPoolMemUsed(void *mem)
{
    MemNode *memNode = GET_MAIN_BY_MEMBER(mem, MemNode, data);
    return ((memNode->flag & MEM_POOL_NODE_USED_FLAG) == MEM_POOL_NODE_USED_FLAG);
}

static inline uint32_t GetMemPoolMemSeq(void *mem)
{
    MemNode *memNode = GET_MAIN_BY_MEMBER(mem, MemNode, data);
    return (uint32_t)(memNode->flag >> MEM_POOL_NODE_SEQ_BITNUM);
}

static inline bool MemPoolMemMatchSeq(void *mem, uint32_t seq)
{
    MemNode *memNode = GET_MAIN_BY_MEMBER(mem, MemNode, data);
    return (memNode->flag == (MEM_POOL_NODE_USED_FLAG | (((uint64_t)seq) << MEM_POOL_NODE_SEQ_BITNUM)));
}
#ifdef __cplusplus
}
#endif
#endif