It has come to dominate theoretical research into concurrency and distribution, and now its time has come to be used. It is a language invented ten years ago for describing concurrent and distributed systems. Performance evaluation of dps coordination strategies modeled. Calculus with local areas of communication tom chothia and ian stark laboratory for foundations of computer science. In the pi calculus, there are mailboxes, each with a name like x. Analyzing distributed picalculus systems by using the. I believe youll find that the article is discussing the. Rahimi department of computer science, southern illinois university, carbondale, il abstract distributed problem solving dps is a subfield of multiagent systems mas concerned with using systems of.
Gian luca cattani and ian stark and glynn winskel, presheaf models for the picalculus. This book proposes a distributed picalculus called adpi, for describing the behaviour of mobile agents in a distributed world. As naming is distributed and involved in communication, the. The cumulative distribution function cdf of the standard normal distribution, usually denoted with the capital greek letter, is the integral. Pdf a study of failure in a distributed picalculus. Multivariable calculus math 21a harvard university spring 2004 oliver knill these are some class notes distributed in a multivariable calculus course tought in spring 2004. With all the advantages that pi calculus offers, it does not provide any. Performance evaluation of dps coordination strategies modeled in picalculus e. Use features like bookmarks, note taking and highlighting while reading a distributed picalculus. Id say that the picalculus is more powerful than the lambdacalculus. In this respect the applied pi calculus also has similarities with the spi. Type inference for the receptive distributed calculus cedric lhoussaine theme 1 reseaux et systemes. The distributed picalculus 14 has a flat structure of locations and ensures uniqueness by the structural congruence rule n p n q. Here location services gives you access to more than 20 location apis, without complex pricing.
A distributed picalculus with local areas of communication. Performance evaluation of dps coordination strategies modeled in pi calculus e. We present a graphical semantics for the picalculus, that is easier to. Perhaps it just isnt rendering well in your browser. Embedding the picalculus into a concurrent functional. Subtyping for session types in the pi calculus 5 the system reduces to. In the pi calculus and the spi calculus, the name for a channel is the capability for the channel. The rules have the form of typing rules for a basic concurrent language, the spi calculus abadi and gordon 1997a. A theory of mobile processes davide sangiorgi and david walker. Secure communications processing for distributed languages. Then it is generalized from monadic to p olyadic form. The mcalculus presented in this paper is designed to overcome the limitations of the distributed join calculus while preserving some of its key features, notably, its. In this section, we briefly introduce the abc calculus by means of a running example. Sandboxing in a distributed picalculus huttel, hans.
It is rst presen ted in its simplest and original form, with the help of sev eral illustrativ e applications. Aalborg universitet sandboxing in a distributed pi. Distributed systems with explicit locations and process mobility are described in terms of the distributed \\pi \calculus. Formal analysis of dynamic, distributed filesystem access. In the rules above, l ranges over actions of the form x. Semantic description of distributed business processes. A higherorder distributed calculus with name creation. Enclose the pdf fxx in the smallest rectangle that fully contains it and whose sides are parallel to the x and y axes. In this thesis, we focus on a calculus that describes physical locations rather than virtual locations and study the behaviour of distributed code, that is systems, in the presence of changes in the state of locations and location structure. We use this language to reason about transactional properties of secure nested transactions. Gian luca cattani and ian stark and glynn winskel, presheaf models for the pi calculus.
The systems described in distributed \\pi \calculus are translated into a rewriting logic which is executable on the maude software platform. The second half of the dissertation considers how to implement the pi calculus efficiently, starting with an abstract machine for pi calculus and finally presenting a compilation of pi calculus to c. The second half of the dissertation considers how to implement the picalculus efficiently, starting with an abstract machine for picalculus and finally presenting a. We define a typed bisimulation equivalence for the language d pi, a distributed version of the. Performance evaluation of dps coordination strategies. Towards a behavioural theory of access and mobility. Synchrony vs causality in the asynchronous picalculus. Type inference for the receptive distributed picalculus.
Access control based on code identity for open distributed. The parameter is the mean or expectation of the distribution and also its median and mode. Download it once and read it on your kindle device, pc, phones or tablets. Our primary result is a robust safety theorem expressed in terms of a distributed higherorder picalculus with code identity and a primitive for remote attestation. Probability this chapter covers probability density functions, cumulative distribution functions, the median, and the mean. Picalculus is a formal method for describing and analyzing the behavior of large distributed and concurrent systems. A picalculus based approach for software composition scg. This book proposes a formal mathematical language, a distributed pi calculus called dpi, for describing, at varying levels of abstraction, the behaviour of mobile agents in a distributed world. Location types involve names that may be bound in terms. It takes into account resource access policies, which can be implemented in d pi using a novel form of dynamic capability types. The pi calculus is just as powerful as the lambda calculus. Picalculus offers a conceptual framework for describing and analyzing the concurrent systems whose configuration may change during the computation. A question that naturally arises is whether these two mechanisms are equivalent, i. In distributed systems it is common for communication between.
Extensions of the picalculus such as applied picalculus 4, the spicalculus 3, the. The prin ter ma y ha v e man links that mak e it do di eren t things, and the serv er can send these to di eren t clien ts to establish di eren access capabilities to a shared resource. Roberto bruni and ugo montanari, cartesian closed double categories, their lambdanotation, and the pi calculus. Using two random numbers, r 1 and r 2, and scaling each to the appropriate dimension of the rectangle by multiplying one by b a and the other by c generate a point that is uniformly distributed over the rectangle. Pi calculus article about pi calculus by the free dictionary.
Milner around 1991 and are documented in the papers by abramsky 1 and by bellin and scott 8. Pdf a study of failure in a distributed picalculus researchgate. Pdf on jan 1, 2006, adrian francalanza and others published a study of failure in a distributed picalculus find, read and cite all the research you need on. Pi calculus offers a conceptual framework for describing and analyzing the concurrent systems whose configuration may change during the computation. Type inference for the receptive distributed picalculus c edric lhoussaine to cite this version. We study the type inference problem for a distributed pi calculus with explicit notions of locality and migration. Formal mathematical models and theories of distributed behaviour are needed in order to understand them.
The dual, expectation parameters for normal distribution are. Ian stark, a fully abstract domain model for the picalculus. The equivalence, based on typed actions between configurations, is. The systems described in distributed \\ pi \ calculus are translated into a rewriting logic which is executable on the maude software platform. Ill get to how we deposit and withdraw messages below. This book proposes a formal mathematical language, a distributed picalculus called dpi, for describing, at varying levels of abstraction, the behaviour of mobile agents in a distributed world. We prove an operational correspondence allowing to verify properly the properties of. It is based on an existing formal language, the picalculus, to which it adds a network layer and a primitive migration construct. Mil95, and discussion con tinues in the concurrency community as to what should constitute a.
This section providesa collection of integrationproblemsfor skillbuilding. We give an intuition of how to model a distributed variant of the wellknown graph colouring problem using abc constructs. A distributed picalculus kindle edition by hennessy, matthew. A behavioral module system for the picalculus tu dortmund. A distributed api for coordinating abc programs springerlink. This project will provide tools that leverage wscdl and pi calculus to build more robust service oriented architectures soa. Abstract the picalculus is a formalism to model and reason about highly concurrent and dynamic systems. Aalborg universitet sandboxing in a distributed picalculus. A t rst sigh it app ears as if the calculus is just a sp ecialised form of v aluepassing pro cess algebra where the. Some of the pages were developed as complements to the text and lectures in the years 20002004. Ian stark, a fully abstract domain model for the pi calculus. Pi calculus is a formal method for describing and analyzing the behavior of large distributed and concurrent systems.
Seman tics is done in terms of b oth a reduction system and a v ersion of lab elled transitions. A distributed pi calculus kindle edition by hennessy, matthew. With all the advantages that picalculus offers, it does not provide any. An extension to picalculus for performance evaluation. Hyland dpmms, university of cambridge 16 mill lane, cambridge cb2 lsb england abstract game semantics is an unusual denotational semantics in that it captures the intentional or algorithmic and dynamical aspects of the computation. Almost every programming language nowadays permits forms of parallelism, implicit, or explicit parallelism like threads, or concurrency. Use features like bookmarks, note taking and highlighting while reading a distributed pi calculus. A stackless runtime environment for a picalculus fr. Roberto bruni and ugo montanari, cartesian closed double categories, their lambdanotation, and the picalculus. Synchronous and asynchronous interactions are the two basic paradigms of interactions in distributed systems.
A distributed picalculus 1, hennessy, matthew, ebook. Formal analysis of dynamic, distributed filesystem access controls avik chaudhuri 1and martn abadi,2 1 computer science department, university of california, santa cruz 2 microsoft research, silicon valley abstract. Transactional correctness for secure nested transactions. Adistributed picalculus distributed systems are fast becoming the norm in computer science. Distributed messagepassing based asynchronous systems are. Rahimi department of computer science, southern illinois university, carbondale, il abstractdistributed problem solving dps is a subfield of multiagent systems mas concerned with using systems of. It is based on an existing formal language, the pi calculus, to which it adds a network layer and a primitive migration construct. You should think of the name x like the key to open the mailboxif you dont have the key, you cant deposit or withdraw messages. Passivation schmitt and stefani is a language construct that elegantly models higherorder distributed behaviours like failure, migration, or duplication e. It is based on the pi calculus but is intended to be more convenient to use, and it is speci cally targeted at modelling security protocols.
Distributed systems with explicit locations and process mobility are described in terms of the distributed \\ pi \ calculus. We render the problem as a typical cas scenario where a collective of agents, executing the same code, collaborate to achieve a systemlevel. Towards a behavioural theory of access and mobility control. In these notes we will use this connection to motivate. New directions in implementing the pi calculus lucian wischik, university of bologna 30th august 2002 do you know what the pi calculus is. A random variable with a gaussian distribution is said to be normally distributed and is called a normal deviate normal distributions are important in statistics and are often used in the natural and social sciences to represent. Finally, as a test case of its adequacy as a logic for distributed computation, we represent our term assignment as a p system. Dannyayers i highly recommend robinmilner s book, communicating and mobile systems. The psicalculi is a parametric framework extending the picalculus with nominal data types for data structures and for logical assertions representing facts about data 5.
1282 264 138 1350 442 337 1538 724 958 64 992 241 658 1240 1205 1 1118 1264 235 1395 415 639 1007 1021 791 2 1482 267 205 1414 695 913 1394 105 943 145 43 1114 992 742 298 1093 1358 861 137 1160