| 摘要 |
PURPOSE:To prevent the performance deterioration of a multi-processor by recognizing the failure of a lock request, if occurs, to avoid the repetition of useless lock requests. CONSTITUTION:A lock control system consists of CPUs 1 and 2 which serve as plural processors and a lock control circuit 3. The CPU1 and 2 send a microprogram instruction which is read out of a control storage register 23 and decoded to an execution control part. The circuit 3 recognizes the failure of a lock request, if occurs, and resets a flip-flop 13. Thus the lock request is suppressed repetitively until a lock release signal which gives a lock enable state is received. When a lock request is accepted, a logic ''0'' is delivered to an output line 131. At the same time, the output of the circuit 3 is stored as it is in flip- flop circuits 18 and 19. |
