blob: 8174cdaa16007d524e7e844963d862844a9abd0b (
plain) (
tree)
|
|
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "cached.h"
static size_t object_size;
static size_t max_cached;
static size_t num_cached;
static void **cache;
int
ca_setup(size_t osize, size_t csize)
{
/* TODO allow osize == 0 following malloc? */
if (osize == 0 || csize == 0) {
return -1;
}
cache = calloc(csize, sizeof(*cache));
if (cache == NULL) {
return -2;
}
object_size = osize;
max_cached = csize;
num_cached = 0;
return 0;
}
void *
ca_alloc(void)
{
assert(cache != NULL);
if (num_cached > 0) {
void *object = cache[--num_cached];
return object;
}
return calloc(1, object_size);
}
void
ca_free(void *object)
{
assert(cache != NULL);
if (object == NULL) {
/* free(3) also does nothing for NULL */
return;
}
if (num_cached < max_cached) {
cache[num_cached++] = object;
/* memset here to catch dangling references */
memset(object, 0, object_size);
return;
}
free(object);
}
void
ca_cleanup(void)
{
for (size_t i = 0; i < num_cached; i++) {
free(cache[i]);
}
free(cache);
cache = NULL;
}
|