System for classifying input/output events for processes servicing the

Abstract

A mixed poll-interrupt system optimizes performance of a processor managing status information indicating the occurrence of service-requiring events generated by I/O devices. Separation logic separates the status information into a first class of more time-critical status indications and a second class of less time-critical status indications. A processor interface is connected to the separation logic and the processor, and stores data identifying status indications in the first class and data identifying status indications in the second class. The processor services the events corresponding to the status indications in the first class with a relatively higher priority routine, such as an interrupt service routine, and services the events corresponding to the status indications in the second class with a relatively lower priority routine, such as a polling routine. The separation logic also includes match logic, which matches addresses or other control information generated by the I/O device, with a prespecified match value which indicates an event having a time-critical need for service. Upon detection of a match, an indication in the first class is generated and serviced by the managing processor with an interrupt service routine.