Interrupt signal accepting apparatus and computer apparatus managing operations of at least two operating systems

Abstract

An interrupt signal accepting apparatus manages two OSs, relates devices sharing the same interrupt number respectively with an OS caused to perform an interrupt processing and an interrupt priority unique to a device, and manages an interrupt number priority conversion table showing the relation between the interrupt number and the interrupt priority. Each device continuously outputs an interrupt request having the same interrupt number until the interrupt processing is completed. An interrupt controller converts the interrupt number into the interrupt priority in accordance with the interrupt number priority conversion table when there is an interrupt signal from the devices. An interrupt signal control section causes a running OS to perform the interrupt processing to change the interrupt priority in the interrupt number priority conversion table when the converted interrupt priority matches an interrupt priority related to the running OS, and stops the running OS and starts the other OS when the interrupt priorities do not match.