Actor-Based Concurrent Language

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Actor-Based Concurrent Language (ABCL) is a family of programming languages, developed in Japan in the 1980s and 1990s.


ABCL/1 (Actor-Based Concurrent Language) is a prototype-based concurrent programming language for the ABCL MIMD system, created in 1986 by Akinori Yonezawa, of the Department of Information Science at the University of Tokyo.

ABCL/1 uses asynchronous message passing among objects to achieve concurrency. It requires Common Lisp. Implementations in Kyoto Common Lisp (KCL) and Symbolics Lisp are available from the author.


An implementation of ABCL/c+ is available from the ACM.[1]


ABCL/R is an object-oriented reflective subset of ABCL/1, written by Professor Akinori Yonezawa of Tokyo Institute of Technology in 1988.


ABCL/R2 is a second generation version of ABCL/R, designed for the Hybrid Group Architecture. It was produced at the Tokyo Institute of Technology in 1992, and has almost all the functionality of ABCL/1. It is written in Common Lisp. As a reflective language, its programs can dynamically control their behavior, including scheduling policy, from within a user-process context.

Further reading[edit]

  • ABCL: An Object-Oriented Concurrent System, A. Yonezawa ed, MIT Press 1990
  • Reflection in an Object-Oriented Concurrent Language, T. Watanabe et al., SIGPLAN Notices 23(11):306-315 (Nov 1988)
  • An Implementation of An Operating System Kernel using Concurrent Object Oriented Language ABCL/c+, N. Doi et al. in ECOOP '88, S. Gjessing et al. eds, LNCS 322, Springer 1988


External links[edit]