By H. Kopetz, M. G. Rodd
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Extra info for Distributed Computer Control Systems 1991: Towards Distributed Real-Time Systems with Predictable Timing Properties
The impossible-mark is inherited towards the root. The LV of the execution interval of the S M with the deadline violation is increased. Then the new LV is inherited to the direct and indirect predecessor execution intervals in the following way: The new LV is compared with the current LV of each direct predecessor execution interval. If the new LV is higher than the stored one, then the new value is stored as the LV of the (predecessor) execution interval. Then, the new value is given to the direct predecessor execution intervals.
1,9-12. Leung, J. -T. and M. L. Merrill (1980). A note on preemptive scheduling of periodic, real-time tasks. 3,115-118. Liu, C. L. and J. W. Layland (1973). Scheduling algorithms for multiprogramming in a hard realtime environment. JACM, Vol. 20, No. 1,4661. Stankovic, J. , Κ. Ramamritham and S. Cheng (1985). Evaluation of a flexible task scheduling algorithm for distributed hard real-time systems. IEEE Transactions on Computers, Vol. C-34,No. 12,1130-1143. • there is only a small difference between the scheduling decision value given from the heuristic to S s and the scheduling decision value given to the predecessor of Sr> After the determination of such a predecessor SM Sp, the LV is increased by a value so that after rolling back the computation to an earlier state and resuming the computation, S P will be given preference before Ss by the heuristic.
A scheduling tree represents all local schedules for this node. All scheduling trees together represent the global schedules for the real-time system. Each tree node is marked with a time stamp and represents a scheduling step. The tree node defines the SM which must be executed in the time interval [ t ^ t j ] ( t ^ is the time are retransmitted. Handling of fixed A t times is the most difficult case in our scheduling algorithm. So we restrict our attention to this case. As depicted in fig. 1 exactly the time Atj must pass between the SEND-SM and the TM-SM and also exactly the time At2 must pass between the TM-SM and the RE- CEIVE-SM in the local scheduling plans.
Distributed Computer Control Systems 1991: Towards Distributed Real-Time Systems with Predictable Timing Properties by H. Kopetz, M. G. Rodd