Periodic process scheduling method

Details Periodic process scheduling method Periodic process scheduling method

G - Physics

06

F

G06F 9/46 (2006.01) G06F 9/48 (2006.01)

Patent

CA 2200929

A scheduling method of a periodic process of a computer system for keeping the execution interval- of each process group constant as far as possible in the case where a plurality of process groups including periodically executed processes are executed in parallel. If a group master process of each process group specifies a wakeup interval period and a required CPU time per period and requests allocation of a CPU time, then a CPU allocation time of a specified process group is secured so as not to collide with a CPU allocation time of another process group, and a scheduling table is created so as to maintain the specified wakeup interval period. In response to arrival of time when one of the process groups should be waked up, a kernel process or a scheduler conducts wakeup by changing execution priority of a process belonging to this process group to highest priority ("raised") in the system, and thereafter maintains the highest priority for CPU allocation time consecutively allocated.

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