/*.......................................................................
* Delete a HashTable free-list. An error will be displayed if the list is
* still in use and the deletion will be aborted.
*
* Input:
* mem HashMemory * The free-list container to be deleted.
* force int If force==0 then _del_HashMemory() will complain
* and refuse to delete the free-list if any
* of nodes have not been returned to the free-list.
* If force!=0 then _del_HashMemory() will not check
* whether any nodes are still in use and will
* always delete the list.
* Output:
* return HashMemory * Always NULL (even if the memory could not be
* deleted).
*/
HashMemory *_del_HashMemory(HashMemory *mem, int force)
{
if(mem) {
if(!force && (_busy_FreeListNodes(mem->hash_memory) > 0 ||
_busy_FreeListNodes(mem->node_memory) > 0)) {
errno = EBUSY;
return NULL;
};
mem->hash_memory = _del_FreeList(mem->hash_memory, force);
mem->node_memory = _del_FreeList(mem->node_memory, force);
mem->string_memory = _del_StringMem(mem->string_memory, force);
free(mem);
};
return NULL;
}
/*.......................................................................
* Create a string free-list container and the first block of its free-list.
*
* Input:
* blocking_factor int The blocking_factor argument specifies how
* many strings of length SM_STRLEN
* bytes (see stringmem.h) are allocated in each
* free-list block.
* For example if blocking_factor=64 and
* SM_STRLEN=16, then each new
* free-list block will take 1K of memory.
* Output:
* return StringMem * The new free-list container, or NULL on
* error.
*/
StringMem *_new_StringMem(unsigned blocking_factor)
{
StringMem *sm; /* The container to be returned. */
/*
* Check arguments.
*/
if(blocking_factor < 1) {
errno = EINVAL;
return NULL;
};
/*
* Allocate the container.
*/
sm = (StringMem *) malloc(sizeof(StringMem));
if(!sm) {
errno = ENOMEM;
return NULL;
};
/*
* Before attempting any operation that might fail, initialize
* the container at least up to the point at which it can safely
* be passed to _del_StringMem().
*/
sm->nmalloc = 0;
sm->fl = NULL;
/*
* Allocate the free-list.
*/
sm->fl = _new_FreeList(SM_STRLEN, blocking_factor);
if(!sm->fl)
return _del_StringMem(sm, 1);
/*
* Return the free-list container.
*/
return sm;
}
