Contents 1 History 2 Example 3 See also 4 References

History[edit] Alef appeared in the first and second editions of Plan 9, but was abandoned during development of the third edition.[1][2] Rob Pike later explained Alef's demise by pointing to its lack of automatic memory management, despite Pike's and other people's urging Winterbottom to add garbage collection to the language;[3] also, in a February 2000 slideshow, 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across multiple architectures, so we took what we learned from it and built the thread library for C."[4] Alef was superseded by two programming environments. The Limbo programming language can be considered a direct successor of Alef and is the most commonly used language in the Inferno operating system. The Alef concurrency model was replicated in the third edition of Plan 9 in the form of the libthread library, which makes some of Alef's functionality available to C programs and allowed existing Alef programs (such as Acme) to be translated.[5]

Example[edit] 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[edit] Communicating sequential processes Plan 9 from Bell Labs

References[edit] ^ a b Winterbottom, Phil (1995). "Alef Language Reference Manual". Plan 9 Programmer's Manual: Volume Two. Murray Hill: AT&T.  ^ "Preface to the Third (2000) Edition". Plan 9 Manual. Murray Hill: Bell Labs. June 2000. Retrieved 2012-10-29.  ^ Pike, Rob (2010). Origins of Go concurrency style. OSCON Emerging Languages Camp.  ^ Pike, Rob. "Rio: Design of a Concurrent Window System" (PDF). Retrieved 8 March 2013.  ^ "thread(2)". Plan 9 Manual. Retrieved 2012-10-29.  Flandrena, Bob (1995). "Alef Users' Guide". Plan 9 Programmer's Manual: Volume Two. Murray Hill: Bell Labs.  Phil Winterbottom (1992-10-20). "Plan9 VM". Newsgroup: comp.os.research. Usenet: 1c1denINN441@darkstar.UCSC.EDU.  This programming-language-related article is a stub. You can help Wikipedia by expanding it. v t e Retrieved from "" Categories: C programming language familyConcurrent programming languagesPlan 9 from Bell LabsProgramming language topic stubsHidden categories: All stub articles

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