METHOD AND APPARATUS IMPLEMENTED IN PROCESSORS FOR REAL-TIME SCHEDULING AND TASK ORGANIZATION BASED ON RESPONSE TIME ORDER OF MAGNITUDE

摘要

A task scheduling method is disclosed, where each processor core is programmed with a short list of priorities, each associated with a minimum response time. The minimum response times for adjacent priorities are different by at least one order of magnitude. Each process is assigned a priority based on how its expected response time compares with the minimum response times of the priorities. Lower priorities may be assigned a timeslice period that is a fraction of the minimum response time. Also disclosed is a task division method of dividing a complex task into multiple tasks is; one of the tasks is an input gathering authority task having a higher priority, and it provides inputs to the other tasks which have a lower priority. A method that permits orderly shutdown or scaling back of task activities in case of resource emergencies is also described.

主权项

1. A method implemented in a processor having one or more logical cores for programming a major task which has a defined response time requirement between one or more inputs and outputs depending upon such inputs, comprising:
subdividing the major task into one first task and one or more second tasks, the first task having a higher priority than the second tasks, the first task having an associated first response time requirement, each second task defining a second output and having an associated second response time requirement, so that the outputs of the major task are produced within the defined response time requirement of the major task; the first task receiving input and timing from one or more sources and using them to create one or more packets with data and timing for corresponding second tasks; and each of the second tasks receiving a packet and producing outputs based on the data and timing contained in the received packet and a state received previously by the second task to produce the second output, wherein the data and timing contained in the packet received by the second task, together with the state received previously by the second task, produces enough state to enable the second task to produce the second output within the second response time requirement.