JPS6436355A - System for diagnosing inter-processor shared memory - Google Patents

Abstract

PURPOSE:To average the frequency of diagnosis, by selecting a processor with a normal function for patrol diagnosis based on priority allocated on each processor in relation to the execution of the diagnosis of a shared memory, and resetting all diagnosis requesting timers in each processor simultaneously at the time of completing the diagnosis. CONSTITUTION:Each of the processors 1 and 2, in case of receiving a request from the timer 22, inspects the presence or absence of another processor having the priority higher than that of its own device and the normal function, and when such processor exists, neglects the request from the timer 22. Each of the processors 1 and 2, when no corresponding processor exists, inspects the amount of load an another processor with the priority lower than that of its own device and the normal function, and when the processor having the minimum amount of load is its own processor, the processor itself executes the diagnosis of the shared memory 3. Each of the processors 1 and 2, when the processor being another processor with the memory 3 to another processor. Each of the processors 1 an 2 resets all timers in the processors in case of executing the diagnosis of the shared memory 3 according to the command fro its own or another processor. In such a way, the frequency of the diagnosis can be averaged, thereby, processing efficiency can be improved.