void is_m_replace_record(is_mtable *tab, const void *rec);
int is_m_write_record(is_mtable *tab, const void *rec);
void is_m_unread_record(is_mtable *tab);
void is_m_replace_record(is_mtable *tab, const void *rec);
int is_m_write_record(is_mtable *tab, const void *rec);
void is_m_unread_record(is_mtable *tab);