| 摘要 |
PURPOSE:To reduce the number of times of main storage access as a system, and to raise efficiency of the whole system, by providing a lock bit, and generating an operation inhibiting signal. CONSTITUTION:A multi-system control device is constituted by connecting processing devices 2, 3 to a main storage device 1, and connecting a system control device 4 to the respective processing devices 2, 3. On this control device 4, FFs 15, 16 showing a lock bit, AND gates 17-22 and OR gates 23-25 are provided. In this state, when the FFs are not receiving a lock request of other processing devices 2, 3 in plural processing devices 2, 3, a lock of one processing device 2 or 3 received, and a lock from the other processing device 3 or 2 is not received. Also, when the lock request from the other processing device 3 or 2 is received, an operation inhibiting signal is sent out to the processing device 3 or 2 in accordance with the lock request or a lock reference requet from the processing device 2 or 3, and efficiency of the whole system is raised. |
