Function lf_hash_delete

mysys/lf_hash.c:411–438

DESCRIPTION deletes an element with the given key from the hash (if a hash is not unique and there're many elements with this key - the "first" matching element is deleted) RETURN 0 - deleted 1 - didn't (not found) -1 - out of memory NOTE see ldelete() for pin usage notes */

    see ldelete() for pin usage notes
*/
int lf_hash_delete(LF_HASH *hash, LF_PINS *pins, const void *key, uint keylen)
{
  LF_SLIST * volatile *el;
  uint bucket, hashnr= calc_hash(hash, (uchar *)key, keylen);

  bucket= hashnr % hash->size;
  lf_rwlock_by_pins(pins);
  el= _lf_dynarray_lvalue(&hash->array, bucket);
  if (unlikely(!el))
    return -1;
  /*
    note that we still need to initialize_bucket here,
    we cannot return "node not found", because an old bucket of that
    node may've been split and the node was assigned to a new bucket
    that was never accessed before and thus is not initialized.
  */
  if (*el == NULL && unlikely(initialize_bucket(hash, el, bucket, pins)))
    return -1;
  if (ldelete(el, hash->charset, my_reverse_bits(hashnr) | 1,
              (uchar *)key, keylen, pins))
  {
    lf_rwunlock_by_pins(pins);
    return 1;
  }
  my_atomic_add32(&hash->count, -1);
  lf_rwunlock_by_pins(pins);
  return 0;
}

/*
  RETURN