Scheduling Aperiodic and Sporadic Jobs in Priority- Driven Systems
Scheduling Aperiodic and Sporadic Jobs in Priority- Driven Systems
Scheduling Aperiodic and Sporadic Jobs in Priority- Driven Systems
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Periodic Server<br />
l� When the server is scheduled <strong>and</strong> executes<br />
aperiodic jobs, it consumes its budget at the<br />
rate of 1 per time unit<br />
l� The budget is exhausted, when it reaches 0<br />
l� A time <strong>in</strong>stant when the budget is replenished<br />
(reloaded) is called replenishment time<br />
Periodic Server<br />
IL2212 Embedded Software 15<br />
l� A periodic server is backlogged whenever the<br />
aperiodic job queue is non-empty<br />
l� It is idle when the queue is empty<br />
l� The server is eligible for execution only when<br />
it is backlogged <strong>and</strong> has non-zero budget<br />
IL2212 Embedded Software 16<br />
8
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