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The reflexive CHAM and the joincalculus
 IN PROCEEDINGS OF THE 23RD ACM SYMPOSIUM ON PRINCIPLES OF PROGRAMMING LANGUAGES
"... By adding reflexion to the chemical machine of Berry and Boudol, we obtain a formal model of concurrency that is consistent with mobility and distribution. Our model provides the foundations of a programming language with functional and objectoriented features. It can also be seen as a process calc ..."
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Cited by 137 (0 self)
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By adding reflexion to the chemical machine of Berry and Boudol, we obtain a formal model of concurrency that is consistent with mobility and distribution. Our model provides the foundations of a programming language with functional and objectoriented features. It can also be seen as a process calculus, the joincalculus, which we prove equivalent to the picalculus of Milner, Parrow and Walker.
Decoding Choice Encodings
, 1999
"... We study two encodings of the asynchronous #calculus with inputguarded choice into its choicefree fragment. One encoding is divergencefree, but refines the atomic commitment of choice into gradual commitment. The other preserves atomicity, but introduces divergence. The divergent encoding is ..."
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Cited by 107 (5 self)
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We study two encodings of the asynchronous #calculus with inputguarded choice into its choicefree fragment. One encoding is divergencefree, but refines the atomic commitment of choice into gradual commitment. The other preserves atomicity, but introduces divergence. The divergent encoding is fully abstract with respect to weak bisimulation, but the more natural divergencefree encoding is not. Instead, we show that it is fully abstract with respect to coupled simulation, a slightly coarserbut still coinductively definedequivalence that does not enforce bisimilarity of internal branching decisions. The correctness proofs for the two choice encodings introduce a novel proof technique exploiting the properties of explicit decodings from translations to source terms.
What is a `Good' Encoding of Guarded Choice?
 INFORMATION AND COMPUTATION
, 1997
"... The calculus with synchronous output and mixedguarded choices is strictly more expressive than the calculus with asynchronous output and no choice. As a corollary, Palamidessi recently proved that there is no fully compositional encoding from the former into the latter that preserves divergenc ..."
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Cited by 74 (4 self)
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The calculus with synchronous output and mixedguarded choices is strictly more expressive than the calculus with asynchronous output and no choice. As a corollary, Palamidessi recently proved that there is no fully compositional encoding from the former into the latter that preserves divergencefreedom and symmetries. This paper shows
The Join Calculus: A Language for Distributed Mobile Programming
 In Proceedings of the Applied Semantics Summer School (APPSEM), Caminha
, 2000
"... In these notes, we give an overview of the join calculus, its semantics, and its equational theory. The join calculus is a language that models distributed and mobile programming. It is characterized by an explicit notion of locality, a strict adherence to local synchronization, and a direct emb ..."
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Cited by 72 (2 self)
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In these notes, we give an overview of the join calculus, its semantics, and its equational theory. The join calculus is a language that models distributed and mobile programming. It is characterized by an explicit notion of locality, a strict adherence to local synchronization, and a direct embedding of the ML programming language. The join calculus is used as the basis for several distributed languages and implementations, such as JoCaml and functional nets.
Global/local subtyping and capability inference for a distributed πcalculus
 In Proceedings of ICALP '98, LNCS 1443
, 1998
"... This paper considers how locality restrictions on the use of capabilities can be enforced by a static type system. A distributed πcalculus with a simple reduction semantics is introduced, integrating location and migration primitives from the Distributed Join Calculus with asynchronous π communicat ..."
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Cited by 66 (11 self)
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This paper considers how locality restrictions on the use of capabilities can be enforced by a static type system. A distributed πcalculus with a simple reduction semantics is introduced, integrating location and migration primitives from the Distributed Join Calculus with asynchronous π communication. It is given a type system in which the input and output capabilities of channels may be either global, local or absent. This allows compiletime optimization where possible but retains the expressiveness of channel communication. Subtyping allows all communications to be invoked uniformly. We show that the most local possible capabilities for internal channels can be inferred automatically.
Foundations of Web Transactions
, 2005
"... Abstract. A timed extension of πcalculus with a transaction construct – the calculus webπ – is studied. The underlying model of webπ relies on networks of processes; time proceeds asynchronously at the network level, while it is constrained by the local urgency at the process level. Namely process ..."
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Cited by 55 (7 self)
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Abstract. A timed extension of πcalculus with a transaction construct – the calculus webπ – is studied. The underlying model of webπ relies on networks of processes; time proceeds asynchronously at the network level, while it is constrained by the local urgency at the process level. Namely process reductions cannot be delayed to favour idle steps. The extensional model – the timed bisimilarity – copes with time and asynchrony in a different way with respect to previous proposals. In particular, the discriminating power of timed bisimilarity is weaker when local urgency is dropped. A labelled characterization of timed bisimilarity is also discussed. 1
A fully abstract may testing semantics for concurrent objects
 In Proceedings of LICS ’02. IEEE, Computer
, 2002
"... This paper provides a fully abstract semantics for a variant of the concurrent object calculus. We define may testing for concurrent object components and then characterise it using a trace semantics inspired by UML interaction diagrams. The main result of this paper is to show that the trace semant ..."
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Cited by 52 (4 self)
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This paper provides a fully abstract semantics for a variant of the concurrent object calculus. We define may testing for concurrent object components and then characterise it using a trace semantics inspired by UML interaction diagrams. The main result of this paper is to show that the trace semantics is fully abstract for may testing. This is the first such result for a concurrent object language. 1.
Bisimulations in the joincalculus
 Theoretical Computer Science
, 1998
"... We propose an objectoriented calculus with internal concurrency and classbased inheritance that is built upon the join calculus. Method calls, locks, and states are handled in a uniform manner, using asynchronous messages. Classes are partial message definitions that can be combined and transforme ..."
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Cited by 51 (7 self)
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We propose an objectoriented calculus with internal concurrency and classbased inheritance that is built upon the join calculus. Method calls, locks, and states are handled in a uniform manner, using asynchronous messages. Classes are partial message definitions that can be combined and transformed. We design operators for behavioral and synchronization inheritance. We also give a type system that statically enforces basic safety properties. Our model is compatible with the JoCaml implementation
History Dependent Automata
, 2001
"... In this paper we present historydependent automata (HDautomata in brief). They are an extension of ordinary automata that overcomes their limitations in dealing with historydependent formalisms. In a historydependent formalism the actions that a system can perform carry information generated i ..."
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Cited by 50 (11 self)
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In this paper we present historydependent automata (HDautomata in brief). They are an extension of ordinary automata that overcomes their limitations in dealing with historydependent formalisms. In a historydependent formalism the actions that a system can perform carry information generated in the past history of the system. The most interesting example is calculus: channel names can be created by some actions and they can then be referenced by successive actions. Other examples are CCS with localities and the historypreserving semantics of Petri nets. Ordinary
Towards an Object Calculus
, 1991
"... The development of concurrent objectbased programmig languages has suffered from the lack of any generally accepted formal foun ion for de finn their semantics. Furthermore, the delicate relation p between objectoriented features supportin reuse an operation features con n g in teraction a n state ..."
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Cited by 49 (9 self)
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The development of concurrent objectbased programmig languages has suffered from the lack of any generally accepted formal foun ion for de finn their semantics. Furthermore, the delicate relation p between objectoriented features supportin reuse an operation features con n g in teraction a n state chan is poorlyun rstood in a con urren t settin To address this problem, we propose the developmen t of an object calculus, borrowi n heavily from relevan t work in the area of process calculi. To this en we briefly review some of this work, we pose some i ormal requiremen ts for an object calculus, an we present the syntax, operation seman tics an use through examples of a proposed object calculus, called OC.