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/*
* BIRD Resource Manager -- SLABs
*
* (c) 1998 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <stdlib.h>
#include <string.h>
#include "nest/bird.h"
#include "lib/resource.h"
/*
* These are only fake, soon to change...
*/
struct sl_obj {
node n;
byte data[0];
};
struct slab {
resource r;
unsigned size;
list objs;
};
static void slab_free(resource *r);
static void slab_dump(resource *r);
static struct resclass sl_class = {
"Slab",
sizeof(struct slab),
slab_free,
slab_dump
};
slab *
sl_new(pool *p, unsigned size)
{
slab *s = ralloc(p, &sl_class);
s->size = size;
init_list(&s->objs);
return s;
}
void *
sl_alloc(slab *s)
{
struct sl_obj *o = xmalloc(sizeof(struct sl_obj) + s->size);
add_tail(&s->objs, &o->n);
return o->data;
}
void
sl_free(slab *s, void *oo)
{
struct sl_obj *o = SKIP_BACK(struct sl_obj, data, oo);
rem_node(&o->n);
xfree(o);
}
static void
slab_free(resource *r)
{
slab *s = (slab *) r;
struct sl_obj *o, *p;
for(o = HEAD(s->objs); p = (struct sl_obj *) o->n.next; o = p)
xfree(o);
}
static void
slab_dump(resource *r)
{
slab *s = (slab *) r;
int cnt = 0;
struct sl_obj *o;
WALK_LIST(o, s->objs)
cnt++;
debug("(%d objects per %d bytes)\n", cnt, s->size);
}
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