You are required to read and agree to the below before accessing a full-text version of an article in the IDE article repository.

The full-text document you are about to access is subject to national and international copyright laws. In most cases (but not necessarily all) the consequence is that personal use is allowed given that the copyright owner is duly acknowledged and respected. All other use (typically) require an explicit permission (often in writing) by the copyright owner.

For the reports in this repository we specifically note that

  • the use of articles under IEEE copyright is governed by the IEEE copyright policy (available at http://www.ieee.org/web/publications/rights/copyrightpolicy.html)
  • the use of articles under ACM copyright is governed by the ACM copyright policy (available at http://www.acm.org/pubs/copyright_policy/)
  • technical reports and other articles issued by M‰lardalen University is free for personal use. For other use, the explicit consent of the authors is required
  • in other cases, please contact the copyright owner for detailed information

By accepting I agree to acknowledge and respect the rights of the copyright owner of the document I am about to access.

If you are in doubt, feel free to contact webmaster@ide.mdh.se

Formal Semantics for PLEX

Fulltext:


Research group:


Publication Type:

Conference/Workshop Paper

Venue:

17th Nordic Workshop on Programming Theory, NWPT05


Abstract

In any system with shared data and concurrent (or independent) activities, there is a need to guarantee exclusive access to the shared data. A system designed for parallel processing handles this by synchronizing the access to the shared data. But if parallel processing, and synchronization, wasn’t an issue at the time of designing the system, non-preemptive execution on a single-processor architecture, automatically guarantees exclusive access to the shared data. The problem arises when the singleprocessor architecture is to be replaced by a multi-processor ditto. At this point, the nonpreemptive execution does not protect the shared data any longer, since independent parts, still executed in a non-preemptive fashion, but on different processors, may now access and update the same data concurrently. The question is: How is such a system to be parallelized? A naive solution would be to re-implement the system, but since a legacy software system may contain several million lines of code, this solution is infeasible. A more reasonable solution would be criteria that ensures when functional equivalence, in some central aspect, is preserved for the existing software when it, is executed on a parallel architecture. To ensure the correctness of such criteria, the formal semantics of the language in question need to be considered.

Bibtex

@inproceedings{Lindhult904,
author = {Johan Lindhult and Bj{\"o}rn Lisper},
title = {Formal Semantics for PLEX},
pages = {65--66},
month = {October},
year = {2005},
booktitle = {17th Nordic Workshop on Programming Theory, NWPT05},
url = {http://www.es.mdh.se/publications/904-}
}