Do the fish really need remote control? A proposal for self-active objects in Oberon

  • Jürg Gutknecht
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1204)


Based on the language Oberon we propose a unified framework for concurrent, object-oriented programming. Inspired by simulation, the idea is to regard objects as processes in contrast with the more common approach treating processes as objects. More concretely, our framework extends the original Oberon language by four new concepts: (a) Object-centered access protection, (b) object-local activity control, (c) system-guarded assertions and (d) preemptive priority scheduling. (a) and (b) are expressed syntactically by upgraded record types, (c) by a passivation/activation mechanism and (d) by a priority option. None of the conventional facilities like semaphores, locks, critical regions, signals, channels, rendez-vous, forks etc. are primitive constructs in our framework. Currently, an implementation of a compiler, a corresponding runtime kernel and a non-blocking local server exists for native Intel architectures.


Object Oriented Programming Active Objects Concurrency Multiprogramming Oberon 


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  1. [1]
    J. Gosling, F. Yellin, The Java Team, The Java Application Programming Interface, Volume 1, Addison-Wesley, 1996.Google Scholar
  2. [2]
    A. Divin, G. Caal, C. Petitpierre, Active Objects: A Paradigm for Communications and Event Driven Systems, Proceedings GLOBECOM'94.Google Scholar
  3. [3]
    K. Nygaard, O.-J. Dahl, Simula 67, History of Programming Languages (R.W. Wexelblat, ed.), Addison-Wesley, 1981.Google Scholar
  4. [4]
    N. Wirth, The Programming Language Oberon, Software — Practice and Experience, 18(7), 671–690.Google Scholar
  5. [5]
    N. Wirth, J. Gutknecht, Project Oberon, Addison-Wesley, 1992.Google Scholar
  6. [6]
    H. Mössenböck, N. Wirth, The Programming Language Oberon-2, Structured Programming, 12, 179–95.Google Scholar
  7. [7]
    A. Disteli, P. Reali, Combining Oberon with Active Objects, Proceedings of the JMLC, Linz, Austria, 1997.Google Scholar
  8. [8]
    J.G.P. Barnes, Programming in Ada, Addison-Wesley, 1994.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • Jürg Gutknecht
    • 1
  1. 1.ETH ZürichSwitzerland

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