WoTUG - The place for concurrent processes

Paper Details

Design Patterns for Communicating Systems with Deadline Propagation

Authors: Korsgaard, Martin, Hendseth, Sverre


Toc is an experimental programming language based on occam that combines CSP-based concurrency with integrated specification of timing requirements. In contrast to occam with strict round-robin scheduling, the Toc scheduler is lazy and does not run a process unless there is a deadline associated with its execution. Channels propagate deadlines to dependent tasks. These differences from occam necessitate a different approach to programming, where a new concern is to avoid dependencies and conflicts between timing requirements. This paper introduces client-server design patterns for Toc that allow the programmer precise control of timing. It is shown that if these patterns are used, the deadline propagation graph can be used to provide sufficient conditions for schedulability. An alternative definition of deadlock in deadline-driven systems is given, and it is demonstrated how the use of the suggested design patterns allow the absence of deadlock to be proven in Toc programs. The introduction of extended rendezvous into Toc is shown to be essential to these patterns.


Communicating Process Architectures 2009, Peter H. Welch, Herman Roebbers, Jan F. Broenink, Frederick R. M. Barnes, Carl G. Ritson, Adam T. Sampson, G. S. Stiles, Brian Vinter, 2009, pp 349 - 361 published by IOS Press, Amsterdam

Files: Paper (PDF), Slides (PDF)

This record in other formats:

Web page: BibTEX, Refer
Plain text: BibTEX, Refer

If you have any comments on this database, including inaccuracies, requests to remove or add information, or suggestions for improvement, the WoTUG web team are happy to hear of them. We will do our best to resolve problems to everyone's satisfaction.

Copyright for the papers presented in this database normally resides with the authors; please contact them directly for more information. Addresses are normally presented in the full paper.

Pages © WoTUG, or the indicated author. All Rights Reserved.
Comments on these web pages should be addressed to: www at wotug.org

Valid HTML 4.01!