Processing group parameters in the real-time specification for Java

ABSTRACT

The Real-Time Specification for Java (RTSJ) supports Processing Groups. However this typically requires the underlying operating system to provide group budgets, which is not widespread practice. As the RTSJ attempts to define its semantics for multiprocessor systems, the issue of the meaning and implementability of the ProcessingGroupParameters class needs to be re-examined. This paper reviews the possible options. It proposes that Processing Groups be directly represented with various subclasses providing different implementation mechanisms. The relationship between Processing Groups and the implementation of non-bound asynchronous event handlers is also explored.

REFERENCES

• 1: M. Aldea , G. Bernat , I. Broster , A. Burns , R. Dobrin , J. M. Drake , G. Fohler , P. Gai , M. Gonzalez Harbour , G. Guidi , J. J. Gutierrez , T. Lennvall , G. Lipari , J. M. Martinez , J. L. Medina , J. C. Palencia , M. Trimarchi, FSF: A Real-Time Scheduling Architecture Framework, Proceedings of the 12th IEEE Real-Time and Embedded Technology and Applications Symposium, p.113-124, April 04-07, 2006 [doi>10.1109/RTAS.2006.18]
• 2: Mario Aldea Rivas , Michael González Harbour, Operating system support for execution time budgets for thread groups, Proceedings of the 13th international workshop on Real-time Ada, April 17-19, 2007, Woodstock, Vermont
• 3: N. C. Audsley. Supporting scaled timers for CPU accounting, private communication, 2008.
• 4: Paul Barham , Boris Dragovic , Keir Fraser , Steven Hand , Tim Harris , Alex Ho , Rolf Neugebauer , Ian Pratt , Andrew Warfield, Xen and the art of virtualization, Proceedings of the nineteenth ACM symposium on Operating systems principles, October 19-22, 2003, Bolton Landing, NY, USA
• 5: Bjorn B. Brandenburg , James H. Anderson, Integrating Hard/Soft Real-Time Tasks and Best-Effort Jobs on Multiprocessors, Proceedings of the 19th Euromicro Conference on Real-Time Systems, p.61-70, July 04-06, 2007 [doi>10.1109/ECRTS.2007.17]
• 6: R. I. Davis , A. Burns, Hierarchical Fixed Priority Pre-Emptive Scheduling, Proceedings of the 26th IEEE International Real-Time Systems Symposium, p.389-398, December 05-08, 2005 [doi>10.1109/RTSS.2005.25]
• 7: Open Group/IEEE. The open group base specifications issue 6, ieee std 1003.1, 2004 edition. IEEE/1003.1 2004 Edition, The Open Group, 2004.
• 8: J. P. Lehoczky, L. Sha, and J. K. Strosnider. Enhanced aperiodic responsiveness in a hard real-time environment. In Proceedings of the IEEE Real-Time Systems Symposium, pages 261--270, 1987.
• 9: R. Rajkumar, K. Juvva, A. Molano, and S. Oikawa. Resource kernels: a resource-centric approach to real-time multimedia systems. In Proceedings of the Multimedia Computing Networks (MMCN 98), 1998.
• 10: F. Siebert. Supporting processing group parameters in jamaica, private communication, 2008.
• 11: B. Sprunt, L. Sha, and J. P. Lehoczky. Aperiodic task scheduling for hard real-time systems. Real-Time Systems, 1:27--69, 1989.
• 12: Andy Wellings, Multiprocessors and the Real-Time Specification for Java, Proceedings of the 2008 11th IEEE Symposium on Object Oriented Real-Time Distributed Computing (ISORC), p.255-261, May 05-07, 2008 [doi>10.1109/ISORC.2008.22]

INDEX TERMS

Primary Classification:
  D. Software
  D.2 SOFTWARE ENGINEERING
        D.2.11 Software Architectures
            Subjects: Domain-specific architectures

Additional Classification:
  D. Software
  D.3 PROGRAMMING LANGUAGES
      D.3.2 Language Classifications

          Nouns: Java
  D.4 OPERATING SYSTEMS
      D.4.7 Organization and Design
          Subjects: Real-time systems and embedded systems

General Terms:
Design, Experimentation, Languages, Measurement, Performance