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| The '''join-calculus''' is a [[process calculus]] developed at [[INRIA]]. The join-calculus was developed to provide a formal basis for the design of distributed programming languages, and therefore intentionally avoids communications constructs found in other process calculi, such as [[synchronous rendezvous|rendezvous]] communications, which are difficult to implement in a distributed setting.<ref>{{cite paper | author=Cedric Fournet, Georges Gonthier | title=The reflexive CHAM and the join-calculus | year = 1995 | url=http://citeseer.ist.psu.edu/fournet95reflexive.html}}, pg. 1</ref> Despite this limitation, the join-calculus is as expressive as the full [[Pi-calculus|<math>\pi</math>-calculus]]. Encodings of the <math>\pi</math>-calculus in the join-calculus, and vice-versa, have been demonstrated.<ref>{{cite paper | author=Cedric Fournet, Georges Gonthier | title=The reflexive CHAM and the join-calculus | year = 1995 | url=http://citeseer.ist.psu.edu/fournet95reflexive.html}}, pg. 2</ref>
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| The join-calculus is a member of the [[Pi-calculus|<math>\pi</math>-calculus]] family of process calculi, and can be considered, at its core, an asynchronous <math>\pi</math>-calculus with several strong restrictions:<ref>{{cite paper | author=Cedric Fournet, Georges Gonthier | title=The reflexive CHAM and the join-calculus | year = 1995 | url=http://citeseer.ist.psu.edu/fournet95reflexive.html}}, pg. 19</ref>
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| *Scope restriction, reception, and replicated reception are syntactically merged into a single construct, the ''definition'';
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| *Communication occurs only on defined names;
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| *For every defined name there is exactly one replicated reception.
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| However, as a language for programming, the join-calculus offers at least one convenience over the <math>\pi</math>-calculus — namely the use of ''multi-way join patterns'', the ability to match against messages from multiple channels simultaneously.
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| ==Languages based on the join-calculus==
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| The [[join-calculus programming language]] is based on the join-calculus process calculus. It is implemented as an interpreter written in [[OCaml]], and supports statically typed distributed programming, transparent remote communication, agent-based mobility, and failure-detection.<ref>{{cite paper | author=Cedric Fournet, Georges Gonthier | title=The Join Calculus: A Language for Distributed Mobile Programming | year = 2000 | url=http://citeseer.ist.psu.edu/670457.html}}</ref>
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| [[JoCaml]] is a version of [[OCaml]] extended with join-calculus primitives.
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| [[Polyphonic C sharp|Polyphonic C#]] and its successor [[Cω]] extend [[C Sharp (programming language)|C#]].
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| [http://www.mcsharp.net MC#] and [http://www.parallelcsharp.com Parallel C#] extend Polyphonic C#. | |
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| [[Join Java]] extends [[Java (programming language)|Java]].
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| The [http://channel.sourceforge.net/ Boost.Join] library is an implementation in C++.
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| A [http://research.microsoft.com/en-us/um/people/crusso/papers/cb.pdf Concurrent Basic] proposal that uses Join-calculus
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| ==References==
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| <references/>
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| ==External links==
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| * INRIA, [http://moscova.inria.fr/join/index.shtml Join Calculus homepage]
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| <!-- this is mostly related to parallel programming -->
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| [[Category:Process calculi]]
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| {{prog-lang-stub}}
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