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29
Structured CommunicationCentred Programming for Web Services
, 2007
"... Abstract. This paper relates two different paradigms of descriptions of communication behaviour, one focussing on global message flows and another on endpoint behaviours, using formal calculi based on session types. The global calculus, which originates from a web service description language (W3C ..."
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Cited by 84 (19 self)
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Abstract. This paper relates two different paradigms of descriptions of communication behaviour, one focussing on global message flows and another on endpoint behaviours, using formal calculi based on session types. The global calculus, which originates from a web service description language (W3C WSCDL), describes an interaction scenario from a vantage viewpoint; the endpoint calculus, an applied typed πcalculus, precisely identifies a local behaviour of each participant. We explore a theory of endpoint projection, by which we can map a global description to its endpoint counterpart preserving types and dynamics. Three principles of wellstructured description and the type structures play a fundamental role in the theory. 1
An observationally complete program logic for imperative higherorder functions
 In Proc. LICS’05
, 2005
"... Abstract. We propose a simple compositional program logic for an imperative extension of callbyvalue PCF, built on Hoare logic and our preceding work on program logics for pure higherorder functions. A systematic use of names and operations on them allows precise and general description of comple ..."
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Cited by 39 (11 self)
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Abstract. We propose a simple compositional program logic for an imperative extension of callbyvalue PCF, built on Hoare logic and our preceding work on program logics for pure higherorder functions. A systematic use of names and operations on them allows precise and general description of complex higherorder imperative behaviour. The proof rules of the logic exactly follow the syntax of the language and can cleanly embed, justify and extend the standard proof rules for total correctness of Hoare logic. The logic offers a foundation for general treatment of aliasing and local state on its basis, with minimal extensions. After establishing soundness, we prove that valid assertions for programs completely characterise their behaviour up to observational congruence, which is proved using a variant of finite canonical forms. The use of the logic is illustrated through reasoning examples which are hard to assert and infer using existing program logics.
A theoretical basis of communicationcentred concurrent programming
, 2006
"... This document presents two different paradigms of description of communication behaviour, one focussing on global message flows and another on endpoint behaviours, as formal calculi based on session types. The global calculus originates from Choreography Description Language, a web service descript ..."
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Cited by 25 (9 self)
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This document presents two different paradigms of description of communication behaviour, one focussing on global message flows and another on endpoint behaviours, as formal calculi based on session types. The global calculus originates from Choreography Description Language, a web service description language developed by W3C WSCDL working group. The endpoint calculus is a typed πcalculus. The global calculus describes an interaction scenario from a vantage viewpoint; the endpoint calculus precisely identifies a local behaviour of each participant. After introducing the static and dynamic semantics of these two calculi, we explore a theory of endpoint projection which defines three principles for wellstructured global description. The theory then defines a translation under the three principles which is sound and complete in the sense that all and only behaviours specified in the global description are realised as communications among endpoint processes. Throughout the theory, underlying type structures play a fundamental role. The document is divided in two parts: part I introduces the two descriptive frameworks using simple but nontrivial examples; the second part establishes a theory of the global and endpoint formalisms.
Basic Theory of Reduction Congruence for Two Timed Asynchronous πCalculi
 IN PROC. CONCUR’04
, 2004
"... We study reduction congruence, a popular notion of process equality, for the asynchronous πcalculus with timers, and derive several alternative characterisations, one of them being a labelled asynchronous bisimilarity. These results are adapted to an asynchronous πcalculus with timers, locatio ..."
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Cited by 18 (2 self)
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We study reduction congruence, a popular notion of process equality, for the asynchronous πcalculus with timers, and derive several alternative characterisations, one of them being a labelled asynchronous bisimilarity. These results are adapted to an asynchronous πcalculus with timers, locations and message failure. In addition we investigate the problem of how to distribute valuepassing processes in a semanticspreserving way.
Linearly Used Effects: Monadic and CPS Transformations into the Linear Lambda Calculus
 In: Proceedings of the 6th International Symposium on Functional and Logic Programming (FLOPS2002). Aizu
, 2002
"... Abstract. We propose a semantic and syntactic framework for modelling linearly used effects, by giving the monadic transforms of the computational lambda calculus (considered as the core calculus of typed callbyvalue programming languages) into the linear lambda calculus. As an instance Berdine et ..."
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Cited by 13 (4 self)
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Abstract. We propose a semantic and syntactic framework for modelling linearly used effects, by giving the monadic transforms of the computational lambda calculus (considered as the core calculus of typed callbyvalue programming languages) into the linear lambda calculus. As an instance Berdine et al.’s work on linearly used continuations can be put in this general picture. As a technical result we show the full completeness of the CPS transform into the linear lambda calculus.
A fully abstract trace semantics for general references
 In: 34th ICALP. Volume 4596 of LNCS
, 2007
"... Abstract. We describe a fully abstract trace semantics for a functional language with locally declared general references (a fragment of Standard ML). It is based on a bipartite LTS in which states alternate between program and environment configurations and labels carry only (sets of) basic values, ..."
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Cited by 11 (0 self)
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Abstract. We describe a fully abstract trace semantics for a functional language with locally declared general references (a fragment of Standard ML). It is based on a bipartite LTS in which states alternate between program and environment configurations and labels carry only (sets of) basic values, location and pointer names. Interaction between programs and environments is either direct (initiating or terminating subprocedures) or indirect (by the overwriting of shared locations): actions reflect this by carrying updates to the shared part of the store. The tracesets of programs and contexts may be viewed as deterministic strategies and counterstrategies in the sense of game semantics: we prove soundness of the semantics by showing that the evaluation of a program in an environment tracks the interaction between the corresponding strategies. We establish full abstraction by proving a definability result: every bounded deterministic strategy of a given type is the traceset of a configuration of that type. 1
Completeness and Logical Full Abstraction in Modal Logics for Typed Mobile Processes
"... Abstract. We study an extension of HennessyMilner logic for the πcalculus which gives a sound and complete characterisation of representative behavioural preorders and equivalences over typed processes. New connectives are introduced representing actual and hypothetical typed parallel composition ..."
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Cited by 7 (4 self)
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Abstract. We study an extension of HennessyMilner logic for the πcalculus which gives a sound and complete characterisation of representative behavioural preorders and equivalences over typed processes. New connectives are introduced representing actual and hypothetical typed parallel composition and hiding. We study three compositional proof systems, characterising the May/Must testing preorders and bisimilarity. The proof systems are uniformly applicable to different type disciplines. Logical axioms distill proof rules for parallel composition studied by Amadio and Dam. We demonstrate the expressiveness of our logic embeddings of program logics for higherorder functions. 1
A game semantics of the asynchronous πcalculus
 In Proceedings of 16th CONCUR
, 2005
"... Abstract. This paper studies the denotational semantics of the typed asynchronous πcalculus. We describe a simple game semantics of this language, placing it within a rich hierarchy of games models for programming languages, A key element of our account is the identification of suitable categorical ..."
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Cited by 6 (0 self)
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Abstract. This paper studies the denotational semantics of the typed asynchronous πcalculus. We describe a simple game semantics of this language, placing it within a rich hierarchy of games models for programming languages, A key element of our account is the identification of suitable categorical structures for describing the interpretation of types and terms at an abstract level. It is based on the notion of closed Freyd category, establishing a connection between our semantics, and that of the λcalculus. This structure is also used to define a trace operator, with which name binding is interpreted. We then show that our categorical characterization is sufficient to prove a weak soundness result. Another theme of the paper is the correspondence between justified sequences, on which our model is based, and traces in a labelled transition system in which only bound names are passed. We show that the denotations of processes are equivalent, via this correspondence, to their sets of traces. These results are used to show that the games model is fully abstract with respect to mayequivalence. 1
M.: Responsiveness in process calculi
, 2008
"... A system guarantees responsive usage of a channel r if a communication along r is guaranteed to eventually take place. Responsiveness is important, for instance, to ensure that any request to a service be eventually replied. We propose two distinct type systems, each of which statically guarantees r ..."
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Cited by 5 (1 self)
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A system guarantees responsive usage of a channel r if a communication along r is guaranteed to eventually take place. Responsiveness is important, for instance, to ensure that any request to a service be eventually replied. We propose two distinct type systems, each of which statically guarantees responsive usage of names in welltyped picalculus processes. In the first system, we achieve responsiveness by combining techniques for deadlock and livelock avoidance with linearity and receptiveness. The latter is a guarantee that a name is ready to receive as soon as it is created. These conditions imply relevant limitations on the nesting of actions and on multiple use of names in processes. In the second system, we relax these requirements so as to permit certain forms of nested inputs and multiple outputs. We demonstrate the expressive power of the two systems by showing that primitive recursive functions – in the case of the first system – and Cook and Misra’s service orchestration language ORC – in the case of the second system – can be encoded into welltyped processes.
Typed event Structures and the πcalculus
 In Proc. MFPS’06
, 2006
"... Abstract. We propose a typing system for the true concurrent model of event structures that guarantees an interesting behavioural property known as confusion freeness. A system is confusion free if nondeterministic choices are localised and do not depend on the scheduling of independent components. ..."
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Cited by 5 (3 self)
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Abstract. We propose a typing system for the true concurrent model of event structures that guarantees an interesting behavioural property known as confusion freeness. A system is confusion free if nondeterministic choices are localised and do not depend on the scheduling of independent components. It is a generalisation of confluence to systems that allow nondeterminism. Ours is the first typing system to control behaviour in a true concurrent model. To demonstrate its applicability, we show that typed event structures give a semantics of linearly typed version of the πcalculi with internal mobility. The semantics we provide is the first event structure semantics of the πcalculus and generalises Winskel’s original event structure semantics of CCS. 1