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An Engineering Approach to Synchronization Based on Overrun for Compositional Real-Time Systems
Publication Type:
Conference/Workshop Paper
Venue:
6th IEEE International SIES
Abstract
Hierarchical scheduling frameworks (HSFs) provide
means for composing complex real-time systems from welldefined
independently developed and analyzed subsystems. To
support shared logical resources requiring mutual exclusive
access in two-level HSFs, overrun without payback has been
proposed as a mechanism to prevent budget depletion during
resource access arbitrated by the stack resource policy (SRP).
In this paper, we revisit the global schedulability analysis of
synchronization protocols based on SRP and overrun without
payback for fixed-priority scheduled HSFs. We derive a new
global schedulability analysis based on the observation that the
overrun budget is merely meant to prevent budget depletion
during global resource access. The deadline of a subsystem
therefore only needs to hold for its normal budget rather than
the sum of the normal and overrun budget. Our novel analysis is
considerably simpler than an earlier, initially improved analysis,
which improved both the original local and global schedulability
analyses. We evaluate the new analysis based on an extensive
simulation study and compare the results with the existing
analysis. Our simplified analysis does not significantly affect
schedulability compared to the initially improved analysis. It
is therefore proposed as a preferable engineering approach to
synchronization protocols for compositional real-time systems.
We accordingly present the implementation of our improvement
in an OSEK-compliant real-time operating system to sketch its
applicability in today’s industrial automotive standards. Both
implementation and run-time overheads are discussed providing
measured results.
Bibtex
@inproceedings{Keskin2095,
author = {Ugur Keskin and Martijn van den Heuvel and Reinder J. Bril and Johan Lukkien and Moris Behnam and Thomas Nolte},
title = {An Engineering Approach to Synchronization Based on Overrun for Compositional Real-Time Systems},
month = {June},
year = {2011},
booktitle = {6th IEEE International Symposium on Industrial Embedded Systems (SIES11)},
url = {http://www.es.mdu.se/publications/2095-}
}