Alef (programming language)
| Paradigm | compiled, concurrent, structured |
|---|---|
| Designed by | Phil Winterbottom |
| First appeared | 1992 |
| Typing discipline | Strong |
| OS | Plan 9 from Bell Labs |
| Influenced by | |
| C, Newsqueak | |
| Influenced | |
| Limbo, Rust | |
The Alef programming language was designed as part of the Plan 9 operating system by Phil Winterbottom of Bell Labs.
History
Alef appeared in the first and second editions of Plan 9, and was abandoned during development of the third edition.[1][2] Plan 9's libthread library, which implements the same concurrency model as Alef, was written to make some of Alef's functionality available to C programs and to allow existing Alef programs (such as Acme) to be translated.[3] In a February 2000 slideshow, Rob Pike noted: “…although Alef was a fruitful language, it proved too difficult to maintain a variant language across multiple architectures, so we took what we learned from it and built the thread library for C.”
Example
This example was taken from the Alef reference manual.[1] The piece illustrates the use of tuple data type.
(int, byte*, byte)
func()
{
return (10, "hello", ’c’);
}
void
main()
{
int a;
byte* str;
byte c;
(a, str, c) = func();
}
See also
- Limbo, a direct successor of Alef, the most commonly used language in the Inferno operating system
- Plan 9 from Bell Labs
- Communicating sequential processes
References
- ^ a b
Winterbottom, Phil (1995). "Alef Language Reference Manual". Plan 9 Programmer's Manual: Volume Two. Murray Hill: AT&T.
{{cite book}}: External link in|chapterurl=|chapterurl=ignored (|chapter-url=suggested) (help) - ^
"Preface to the Third (2000) Edition". Plan 9 Manual. Murray Hill: Bell Labs. June 2000.
{{cite book}}:|access-date=requires|url=(help); External link in|sectionurl=|sectionurl=ignored (|section-url=suggested) (help) - ^
"thread(2)". Plan 9 Manual.
{{cite book}}:|access-date=requires|url=(help); External link in|sectionurl=|sectionurl=ignored (|section-url=suggested) (help)
- Flandrena, Bob (1995). "Alef Users' Guide". Plan 9 Programmer's Manual: Volume Two. Murray Hill: Bell Labs.
{{cite book}}: External link in|chapterurl=|chapterurl=ignored (|chapter-url=suggested) (help) - Phil Winterbottom (1992-10-20). "Plan9 VM". Newsgroup: comp.os.research. 1c1denINN441@darkstar.UCSC.EDU.
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