/* free memory allocated for the global cache */
void destroy_im_hash(void)
{
if (!IM_HASH) return;
if (IM_HASH->entries) free_im_hash(IM_HASH->entries);
shm_free(IM_HASH);
IM_HASH = NULL;
}
/* reload DB cache
* return value
* 0: success
* -1: error
*/
int reload_im_cache(void)
{
im_entry_t **hash, **old_hash;
int ret;
/* make sure that there is no other writer process */
writer_lock_imhash();
if (!(hash = new_im_hash())) {
writer_release_imhash();
return -1;
}
ret = load_db(hash);
if (ret == -1) {
/* error occured */
LOG(L_ERR, "ERROR: reload_im_cache(): could not reload cache\n");
free_im_hash(hash); /* there can be data in the hash already */
writer_release_imhash();
return -1;
} else if (ret == -2) {
/* SQL table was empty -- drop hash table */
delete_im_hash(hash);
hash = NULL;
}
old_hash = IM_HASH->entries;
/* ask reader processes to stop reading */
set_wd_imhash();
IM_HASH->entries = hash;
del_wd_imhash();
if (old_hash) free_im_hash(old_hash);
writer_release_imhash();
return 0;
}
