DETECTION OF ABNORMALITY OF SHARED MEMORY SUB-SYSTEM

摘要

PURPOSE:To judge the abnormality of the power source of a shared memory device and the destruction/non-destruction of the shared memory with only one flag without the need of a notice route except for the write/read route of data and to erase the recording of the flag by recognizing the destruction/ non-destruction of a memory content in the shared memory by means of permitting respective computers to access to a memory content destruction flag. CONSTITUTION:Host computers 21-2n inquire of a monitor controller 71 the state of the memory content destruction flag 73 through interface devices 31-3n at the rise time. Since a power device 61 shows that feeding output voltage formerly becomes abnormal when the monitor controller 71 answers that the memory content destruction flag 73=[1], the host corresponds 21-2n recognize that the content of the common memory device 41 is destroyed. When the monitor controller 71 accepts that the memory contect destruction flag 73=[0], the host computers 21-2n recognize that the content of the common memory device 41 is preserved.