Update Documentation

1 files changed, 111 insertions, 0 deletions

diff --git a/src/include/engine/delkeys.c b/src/include/engine/delkeys.c
new file mode 100644
index 0000000..ad9c228
--- /dev/null
+++ b/src/include/engine/delkeys.c
@@ -0,0 +1,111 @@
+#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;
+}