void * kmem_get_obj(struct kmem_cache_t *cachep)
{
struct slab *slabp = NULL;
void *obj = NULL;
repeat:
slabp = kmem_get_slab(cachep);
/*printf("slabp = %x.", slabp);*/
obj = slab_get_obj(cachep, slabp);
if(obj == NULL)
{
if(cachep->nr_pages >= pow(2,MAX_SLAB_PAGES))
{
return NULL;
}
else
{
cache_grow(cachep);
goto repeat;
}
}
return obj;
}
void kmem_cache_free(struct kmem_cache *cache, void *ptr)
{
struct kmem_slab *slab = kmem_get_slab(ptr);
const bool enabled = spin_lock_irqsave(&cache->lock);
slab->ops->free(cache, slab, ptr);
++slab->free;
if (slab->free == slab->total) {
list_del(&slab->link);
list_add(&slab->link, &cache->free_list);
spin_unlock_irqrestore(&cache->lock, enabled);
return;
}
if (slab->free == 1) {
list_del(&slab->link);
list_add(&slab->link, &cache->part_list);
}
spin_unlock_irqrestore(&cache->lock, enabled);
}
void * kmem_get_obj(kmem_cache_t *cachep)
{
struct slab *slabp = NULL;
void *obj = NULL;
repeat:
slabp = kmem_get_slab(cachep);
obj = slab_get_obj(cachep, slabp);
if(obj)
{
return obj;
}
/* get obj is NULL but this kmem_cache_t has free objs */
else
{
if(obj == NULL && cachep->nr_frees > 0)
{
return NULL;
}
else
{
if(cachep->nr_pages >= pow(2,MAX_SLAB_PAGES))
{
return NULL;
}
else
{
cache_grow(cachep);
goto repeat;
}
}
}
return obj;
}