TASK PROCESSING DEVICE IMPLEMENTING TASK SWITCHING USING MULTIPLE STATE REGISTERS STORING PROCESSOR ID AND TASK STATE

A plurality of tasks are processed simultaneously in a plurality of CPUs. A task control circuit is connected to the plurality of CPUs, and when executing a system call signal instruction, each CPU transmits a system call signal to the task control circuit. Upon receipt of a system call signal from a CPU 0, the task control circuit 200 refers to a processor management register, identifies a RUN-task of the CPU 0, selects a READY-task that is to be executed next, switches process data of the RUN-task and process data of the READY-task, and updates processor management information.