對大小固定的物件提供的物件池工具，當對記憶體分配的請求大小不固定時，使用其它的通用記憶體池.
fix_obj_pool.h
#ifndef _fix_obj_pool_h#define _fix_obj_pool_h
struct fix_obj_pool;
/** obj_size:物件大小
* default_size:預設物件池大小
* align4:返回的物件位址是否需要對齊到4位元組
*/extern
struct fix_obj_pool *create_pool(unsigned int obj_size,int default_size,int align4);
extern
void destroy_pool(struct fix_obj_pool **pool);
/** 分配和**
*/extern
void *pool_alloc(struct fix_obj_pool*);
extern
void pool_dealloc(struct fix_obj_pool*,void*);
extern unsigned int alignsize(unsigned int obj_size);
extern unsigned int get_free_size(struct fix_obj_pool *pool);
#endif
fix_obj_pool.c
#include "fix_obj_pool.h
"#include
#include
#include
static
const
char invalid_index = -1;
static
const unsigned int block_obj_size = 128;
struct block;};
inline void *block_get(struct block *_block,unsigned int index)
inline int block_check(struct block *_block,void *obj)
void block_destroy(struct block **_block)
void block_init(struct block *_block,unsigned int obj_size)
char *link = (char*)block_get(_block,block_obj_size-1);
*link = invalid_index;
_block->m_next_block = 0;
}struct block *block_create(unsigned int obj_size)
void* block_alloc(struct block *_block)
inline unsigned int block_get_obj_index(struct block *_block,void* obj)
void block_dealloc(struct block *_block,void* obj)
else
_block->m_tail = index;
++_block->m_freesize;
}inline unsigned char block_getfreesize(struct block *_block)
inline void block_setnextblock(struct block *_block,struct block *next)
inline struct block *block_getnext(struct block *_block)
inline char *block_getlastaddr(struct block *_block)
struct chunk
;inline struct block *chunk_get(struct chunk *_chunk,unsigned int index)
void chunk_init(struct chunk *_chunk,unsigned int block_count,unsigned int block_size,unsigned int obj_size)
for(i = 0; i < block_count-1; ++i)
block_setnextblock(chunk_get(_chunk,block_count-1),0);
_chunk->m_head = chunk_get(_chunk,0);
_chunk->m_tail = chunk_get(_chunk,block_count-1);
_chunk->m_next = 0;
}struct chunk *chunk_create(unsigned int block_count,unsigned int obj_size)
void chunk_destroy(struct chunk **_chunk)
void* chunk_alloc(struct chunk *_chunk)
--_chunk->m_freesize;
return ret;
}inline int chunk_check(struct chunk *_chunk,void *obj)
void chunk_dealloc(struct chunk *_chunk,void* obj)
else
_chunk->m_tail = chunk_get(_chunk,index);
}++_chunk->m_freesize;
}inline unsigned int chunk_getfreesize(struct chunk *_chunk)
inline char *chunk_getblocksaddr(struct chunk *_chunk)
inline char *chunk_getlastaddr(struct chunk *_chunk)
inline void chunk_setnext(struct chunk *_chunk, struct chunk * next)
inline struct chunk *chunk_getnext(struct chunk *_chunk)
#define default_chunk_count 128 //
當chunk數量大於此值時將採用動態分配
struct fix_obj_pool
;unsigned int alignsize(unsigned int obj_size)
struct fix_obj_pool *create_pool(unsigned int obj_size,int default_size,int align4)
struct fix_obj_pool *pool = malloc(sizeof(*pool));
if(pool)
return pool;
}void destroy_pool(struct fix_obj_pool **pool)
void* pool_alloc(struct fix_obj_pool *pool)
//對所有的chunk按其位址順序排序
unsigned int size = pool->chunk_count;
int i = size-2;
for( ; i >= 0; --i)
else}}
}return ret;
}struct chunk *binsearch(struct fix_obj_pool *pool,void *obj)
if(chunk_check(pool->ptr_chunk[beg],obj) == 1)
return pool->ptr_chunk[beg];
return0;}
void pool_dealloc(struct fix_obj_pool *pool,void* obj)
else
pool->m_head = pool->m_tail = _chunk;
}pool->m_lastdealloc = _chunk;}}
unsigned int get_free_size(struct fix_obj_pool *pool)
return totalsize;
}
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