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 which developed the language was led by P. Rovner in 1984.[1]
| Paradigms | imperative, structured, modular, data and procedure hiding, concurrent |
|---|---|
| Family | Wirth Modula |
| Designed by | Paul Rovner, Roy Levin, John Wick |
| Developer | DEC Systems Research Center (SRC) Acorn Research Center |
| First appeared | 1984 |
| Typing discipline | Static, strong, safe |
| Scope | Lexical |
| OS | Cross-platform |
| License | Proprietary |
| Major implementations | |
| DEC SRC Modula-2+, CAMEL (C and Modula Exexcution Library) | |
| Dialects | |
| DEC SRC | |
| Influenced by | |
| Pascal, ALGOL, Modula-2 | |
| Influenced | |
| Modula-3 | |
Main differences with Modula-2:
- Concurrency;[2] different than the concept of coroutine, which was already part of Modula-2
- Exception handling
- Garbage collection[2]
Implementations edit
Modula-2+ was used to develop Topaz, an operating system for the SRC DEC Firefly shared memory asymmetric multiprocessing workstation.[3] Most Topaz applications were written in Modula-2+, which grew along with the development of the system.[4] Modula-2+ was also used by Acorn in the ARX operating system, and to build an integrated development environmentin the Acorn Research Center (ARC).[5] Modula-2+ strongly influenced other languages such as Modula-3, but as of 2005, it had disappeared.
The original developers of Modula-2+ were both acquired: Acorn by Olivetti and Digital Equipment Corporation by Compaq. Compaq was bought by Hewlett-Packard. Olivetti sold the Olivetti Research Center and Olivetti Software Technology Laboratory (after bought Acorn ARC) to Oracle Corporation and was later absorbed by AT&T.[6] DEC have made the SRC-reports available to the public.
See also edit
References edit
- ^ Rovner, Paul; Levin, Roy; Wick, John (January 11, 1985). SRC-RR-3 On extending Modula-2 for building large, integrated systems. Hewlett-Packard Labs (Report).
- ^ a b DeTreville, John (November 22, 1990). Experience with concurrent garbage collectors for Modula-2+ SRC-RR-64. Hewlett-Packard Labs (Report).
- ^ Thacker, Charles P.; Stewart, Lawrence C.; Satterthwaite, Edwin H. Jr. (December 30, 1987). Firefly: a multiprocessor workstation SRC-RR-23. Hewlett-Packard Labs (Report).
- ^ McJones, Paul R.; Swart, Garret F. (September 28, 1987). Evolving the Unix system interface to support multithreaded programs SRC-RR-21. Hewlett-Packard Labs (Report).
- ^ Cardelli, Luca; Donahue, James; Glassman, Lucille; Jordan, Mick; Kalsow, Bill; Nelson, Greg (November 1989). Modula-3 Report (revised), Research Report 52, SRC-RR-052. Hewlett-Packard Labs (Report). DEC Systems Research Center (SRC).
- ^ Kossow, Al (August 2001). "Not a RISC by Thursday". Newsgroup alt.folklore.computers,comp.sys.acorn.misc.