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Hard Real time question: Are these tasks schedulable?

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jig

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This question is mentioned Real-time System by Liu. Exercise 6.30.


A system has periodic tasks (2.5, 0.5) (90, 15) (150, 24), plus two tasks that process messages that will be modeled as (20, 2) and (360, 3) (that is, 20 and 360 are the minimum times between the messages, for each kind). At a message arrival there is 0.9 units non-pre-emptable ISR time that can be modeled as blocking, followed by a message handling task. Are the tasks schedulable?

Can anybody give me hint to solve? or if you have solution manual, please send me.

Thank you
 

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