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Extra resources for Distributed Computer Control Systems 1991: Towards Distributed Real-Time Systems with Predictable Timing Properties
Sample text
Therefore execution time slots for send and receive protocols must be reserved in the local scheduling plans. Our specification tool offers the possibility to define different kinds of communication patterns for each communication of the application, ranging from pure datagram protocols to reliable protocols with acknowledgments and retransmissions of lost messages. Furthermore, for each computer node different types of communication hardware can be specified. The scale ranges from simple hardware without buffers for incoming and The off-line scheduler requires to know the maximum execution time of each SM which must not be exceeded at run-time.
The term LV/length of the execution interval is the gradient of the line. At each scheduling step H4a, H4b and H4c use the equation of their line ( (LV/length of the execution interval)*(t-LB) ) to determine a value V for each schedulable SM. The SM with the highest value is used to extend the schedule. / / line with the gradient LV / length of the execution interval execution interval Fig. 3. Placement of the line in an execution interval for heuristics H4a, H4b and H4c After each scheduling step the selected son node is marked with a time stamp and a deadline check is made.
D e t a i l s are n o t given d u e t o lack of space. Semantic equivalence. W i t h this definition of the s e m a n tics of F N L O G , we can easily show that the statecharts syntactic c o m p o n e n t s and their m a p p e d F N L O G specifications b o t h m a p t o the s a m e subset of c o m p u t a t i o n histories. T h e consequence of this result is that any statechartsb a s e d specification m a y b e translated into a semantically equivalent F N L O G specification using the m a p p i n g s defined.