/* Function: MemBucket *mempool_alloc(MemPool *mempool);
*
* Purpose: allocate a new object from the mempool
* Args: mempool - pointer to a MemPool struct
*
* Returns: a pointer to the mempool object on success, NULL on failure
*/
MemBucket *mempool_alloc(MemPool *mempool)
{
SDListItem *li = NULL;
MemBucket *b;
if(mempool == NULL)
{
return NULL;
}
if(mempool->free <= 0)
{
return NULL;
}
/* get one item off the free_list,
put one item on the usedlist
*/
li = mempool->free_list.head;
mempool->free--;
if((li == NULL) || sf_sdlist_remove(&mempool->free_list, li))
{
printf("Failure on sf_sdlist_remove\n");
return NULL;
}
mempool->used++;
if(sf_sdlist_append(&mempool->used_list, li->data, li))
{
printf("Failure on sf_sdlist_append\n");
return NULL;
}
/* TBD -- make configurable */
b = li->data;
bzero(b->data, mempool->obj_size);
return b;
}
void mempool_free(MemPool *mempool, MemBucket *obj)
{
if(sf_sdlist_remove(&mempool->used_list, obj->key))
{
printf("failure on remove from used_list");
return;
}
mempool->used--;
/* put the address of the membucket back in the list */
if(sf_sdlist_append(&mempool->free_list, obj, obj->key))
{
printf("failure on add to free_list");
return;
}
mempool->free++;
return;
}
void mempool_free(MemPool *mempool, MemBucket *obj)
{
if ((mempool == NULL) || (obj == NULL))
return;
if(sf_sdlist_remove(&mempool->used_list, obj->key))
{
#ifdef TEST_MEMPOOL
printf("failure on remove from used_list");
#endif
return;
}
/* put the address of the membucket back in the list */
if(sf_sdlist_append(&mempool->free_list, obj, obj->key))
{
#ifdef TEST_MEMPOOL
printf("failure on add to free_list");
#endif
return;
}
return;
}
