????? ????? ????? ???? ???? ???????? ?? ?? ???? ??? ?????? ???????? ???? ??? ????????????? ??? ?? ?????? ??? ?? ???????, ?????????? ???? ????? ??? ???? ??????? ??? ??????? ??? ??? ????? ???.??? ????????? ???? ???? ??????? ???????? ???? ??? ????????? ???.Flag semaphore employs rods or flags held specifically positions to send messages on the receive