Modula-2+

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Modula-2+
Paradigm(s) imperative, structured, modular
Designed by DEC Systems Research Center SRC and Acorn Research Center
Developer DEC Systems Research Center SRC and Acorn Research Center
Appeared in 1980s
Typing discipline strong, static
Major implementations DEC SRC Modula-2+, CAMEL (Compiler for Acorn Modula-2 Extended Language)
Dialects DEC SRC
Influenced by Pascal, ALGOL, Modula-2
Influenced Modula-3
OS Cross-platform (multi-platform)

Modula-2+ is a programming language descended from the Modula-2 language. It was developed at DEC Systems Research Center (SRC) and Acorn Computers Ltd Research Centre in Palo Alto, California. Modula-2+ is Modula-2 with exceptions and threads. The group who developed the language was led by P. Rovner in 1984.[1]

Main differences with Modula-2:

  • Concurrency (different from the concept of coroutines which has already been there as a part of classic Modula-2)
  • Exception handling
  • Garbage collection

Implementations[edit]

Modula-2+ has been used to develop Topaz, an operating system for the DEC SRC Firefly Multiprocessor.[2] Most Topaz applications were written in the Modula-2+ programming language which grew along with the development of the system.[3] Also to build a programming environment for it in the Acorn Research Center ARC.[4] The language has now completely disappeared but was of great influence to other programming languages such as Modula-3.

The original developers of Modula-2+ were both bought; Acorn by Olivetti and Digital Equipment Corporation by Compaq. Compaq itself was bought by Hewlett-Packard. Olivetti also sold the Olivetti Research Center and Olivetti Software Technology Laboratory (after bought Acorn ARC) to Oracle and was later absorbed by AT&T.[5] DEC have made the SRC-reports available to the public.

References[edit]

  1. ^ SRC-RR-3 On extending Modula-2 for building large, integrated systems. - Rovner, Paul; Levin, Roy; Wick, John
  2. ^ SRC-RR-23 Firefly : a multiprocessor workstation. - Thacker, Charles P.; Stewart, Lawrence C.; Satterthwaite, Edwin H. Jr.
  3. ^ SRC-RR-21 Evolving the UNIX system interface to support multithreaded programs. - McJones, Paul R.; Swart, Garret F
  4. ^ SRC-RR-052 Modula-3 Report (revised). Luca Cardelli, James Donahue, Lucille Glassman, Mick Jordan, Bill Kalsow, Greg Nelson. DEC Systems Research Center (SRC) Research Report 52 (November 1989)
  5. ^ Not A RISC By Thursday Al Kossow. alt.folklore.computers,comp.sys.acorn.misc Newsgroup (August 2001)

External links[edit]