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#include <threads.h>
#include <stdlib.h>
#include <string.h>
#include "engine.h"
#include "utils.h"
static int delkey_helper(void *thr_data);
static int delkey(tablist_t *, int, char *);
static struct params *pass(mtx_t *mtx, tablist_t *list, char **keys, int len, int id);
struct params {
mtx_t *mtx;
tablist_t *copy;
char **keys;
int len;
int id;
};
int delkeys(tablist_t *list, int id, char **keys, int len)
{
mtx_t mtx;
if (id >= list[0].len || id < -1 || len < 0)
return -1;
if (mtx_init(&mtx, mtx_plain) != thrd_success)
return -2;
int rc = 0;
tablist_t *copy = calloc(list[0].len, sizeof(tablist_t));
copytab(copy, list);
if (id == -1) {
thrd_t *thrds = calloc(list[0].len, sizeof(thrd_t));
for (int i = 0; i < copy[0].len; ++i)
thrd_create(&thrds[i], delkey_helper, pass(&mtx, copy, keys, len, i));
for (int i = 0; i < copy[0].len; ++i) {
if (rc)
thrd_join(thrds[i], NULL);
else
thrd_join(thrds[i], &rc);
}
free(thrds);
} else
rc = delkey_helper(pass(&mtx, copy, keys, len, id));
if (!rc) {
dellist(list);
memmove(list, copy, copy[0].len * sizeof(tablist_t));
} else
dellist(copy);
mtx_destroy(&mtx);
free(copy);
return rc;
}
static int delkey_helper(void *thr_data)
{
int rc = 0;
struct params *p = (struct params *) thr_data;
mtx_lock(p->mtx);
if (p->len > 0 && p->keys != NULL)
for (int i = 0; i < p->len; ++i) {
if (p->keys[i] == NULL) {
mtx_unlock(p->mtx);
free(p);
return -3;
}
rc = delkey(p->copy, p->id, p->keys[i]);
}
else {
tablist_t *indexes = getkeys(p->copy, p->id, NULL, 0);
for (int i = 0; indexes[0].tab[i].flag; ++i)
rc = delkey(p->copy, p->id, indexes[0].tab[i].key);
free(indexes);
}
mtx_unlock(p->mtx);
free(p);
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;
}
static struct params *pass(mtx_t *mtx, tablist_t *list, char **keys, int len, int id)
{
struct params *p = calloc(1, sizeof(struct params));
p->mtx = mtx;
p->copy = list;
p->keys = keys;
p->len = len;
p->id = id;
return p;
}
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