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#include <threads.h>
#include <stdlib.h>
#include <string.h>
#include "mdb.h"
#include "utils.h"
static int delkey_helper(void *thr_data);
static int delkey(tablist_t *, int, char *);
tablist_t *delkey_copy;
char **delkeys_keys;
int keys_len;
mtx_t delkey_mtx;
int delkeys(tablist_t *list, int id, char **keys, int len)
{
if (id < -1 || len < 0)
return -1;
if (mtx_init(&delkey_mtx, mtx_plain) != thrd_success)
return -2;
int rc = 0;
delkey_copy = calloc(list[0].len, sizeof(tablist_t));
copytab(delkey_copy, list);
delkeys_keys = keys;
keys_len = len;
if (id == -1) {
thrd_t *thrds = calloc(list[0].len, sizeof(thrd_t));
for (int i = 0; i < delkey_copy[0].len; ++i)
thrd_create(&thrds[i], delkey_helper, clone(i));
for (int i = 0; i < delkey_copy[0].len; ++i) {
if (rc)
thrd_join(thrds[i], NULL);
else
thrd_join(thrds[i], &rc);
}
free(thrds);
} else
rc = delkey_helper(clone(id));
if (!rc) {
dellist(list);
memmove(list, delkey_copy, delkey_copy[0].len * sizeof(tablist_t));
} else
dellist(delkey_copy);
mtx_destroy(&delkey_mtx);
free(delkey_copy);
return rc;
}
static int delkey_helper(void *thr_data)
{
int rc = 0;
int *id = (int *) thr_data;
mtx_lock(&delkey_mtx);
if (keys_len > 0 && delkeys_keys != NULL)
for (int i = 0; i < keys_len; ++i) {
if (delkeys_keys[i] == NULL)
return -3;
rc = delkey(delkey_copy, *id, delkeys_keys[i]);
}
else {
tablist_t *indexes = getkeys(delkey_copy, *id, NULL, 0);
for (int i = 0; indexes[0].tab[i].flag; ++i)
rc = delkey(delkey_copy, *id, indexes[0].tab[i].key);
free(indexes);
}
mtx_unlock(&delkey_mtx);
free(id);
return rc;
}
static int delkey(tablist_t *list, int id, char *key)
{
int idx = hash(key);
if (list[id].tab[idx].key == NULL)
return 1;
while (strcmp(list[id].tab[idx].key, key) && idx < TABLEN)
idx++;
if (idx >= TABLEN)
return 2;
free(list[id].tab[idx].key);
list[id].tab[idx].key = NULL;
if (list[id].tab[idx].flag == 3) {
free(list[id].tab[idx].value.str);
list[id].tab[idx].value.str = NULL;
}
list[id].tab[idx].flag = 0;
return 0;
}
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