Interrupt priority control within a nested interrupt system

Details Interrupt priority control within a nested interrupt system Interrupt priority control within a nested interrupt system

2007-04-17

2007-04-17

Lee, Christopher E. (Department: 2111)

Electrical computers and digital data processing systems: input/

Interrupt processing

Interrupt prioritizing

C710S262000, C712S244000

Reexamination Certificate

active

10775334

ABSTRACT:
A data processing system2having a nested interrupt controller24supports nested active interrupts. The priority levels associated with different interrupts are alterable (possibly programmable) whilst the system is running. In order to prevent problems associated with priority inversions within nested interrupts, the nested interrupt controller when considering whether a pending interrupt should pre-empt existing active interrupts, compares the priority of the pending interrupt with the highest priority of any of the currently active interrupts that are nested together.

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