J.-P. Briot, From Objects to Actors: Study of a Limited Symbiosis in Smalltalk80, Research Report LITP 88-58 RXF, Universite Paris VI, Paris, France, September 1988.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....has become the basis for many concurrent and distributed implementations. ConcurrentSmalltalk [41] unifies objects and processes and both synchronous and asynchronous communications are provided, although RPC methods are sometimes preferred if compatibility with sequential Smalltalk is required [25]. Objects are also distributed and can concurrently service messages. DistributedSmalltalk is intended to provide a sharing mechanism for distributed objects, 42] describes a system which uses proxies and object migration in conjunction with distributed garbage collection. Smalltalk is, however, ....

....messages. DistributedSmalltalk is intended to provide a sharing mechanism for distributed objects, 42] describes a system which uses proxies and object migration in conjunction with distributed garbage collection. Smalltalk is, however, compatible with other modes of computation, for instance [25] describes an actor based Smalltalk implementation called Actalk which implements most of the facilities provided by ABCL 1. Concurrent and Distributed Smalltalk have also been combined in a single system [91] DOWL [1] is a distributed version of the Trellis Owl system [95, 69] This uses a ....

J.-P. Briot. From Objects to Actors: Study of a Limited Symbiosis in Smalltalk-80. SIGPLAN Notices, 24(4):69--72, Apr 1989.

....maintained when an inheritance discipline is added, determine the usefulness of a concurrent OOP language in general and of the actor model specifically for real time applications, and design the kernel of an operating system (called the REACT kernel) to meet the needs of real time system. Actalk [24] is an implementation of Actors in Smalltalk 80. It is designed as a minimal extension which preserves the original Smalltalk 80 language, i.e. it is designed as a superset of Smalltalk. Standard Smalltalk 80 objects are passive, but actors are active and autonomous. An actor is built from a ....

Briot J., From Objects to Actors: Study of a limited Symbiosis in Smalltalk-- 80, ACM SIGPLAN Workshop on Object-Based Concurrent Programming, Proceeding, SIGPLAN Notices, 24(4):69--72, 1988.

....to the Acore Pract compiler [Manning 87] specializing the MVC based Smalltalk 80 programming environment for Actalk, and completing a distributed implementation designed along our model. We also need to state more formal rules for safety of combination. The complete version of this paper [Briot 88] includes all code for Actalk kernel, extensions and examples, plus an extensive discussion (about 50 pages) ....

J.-P. Briot, From Objects to Actors: Study of a Limited Symbiosis in Smalltalk80, Research Report LITP 88-58 RXF, Universite Paris VI, Paris, France, September 1988.

.... choisi comme support d etudes pour la mod elisation de protocoles de communication entre processeurs d edi es au traitement du signal [Fron 89] et la mod elisation de strat egies de migration d acteurs dans le cadre du projet Mering IV sp ecialis e pour les syst emes multi agents [Ferber et Briot 88] Cependant, malgr e ses avantages, la plateforme Actalk n o re qu une simulation du parall elisme. Pour y rem edier, nous d ebutons actuellement la conception d un environnement d ex ecution d acteurs sur machines parall eles. Cet environnement sera une extension du langage C , equivalente ....

....des classes permet de classi er les di erents mod eles d acteurs, et la g en ericit e permet un contr ole modulaire des ev enements. Le noyau d Actalk a et e etendu avec succ es pour d ecrire divers mod eles de calcul et d impl ementation. L extension Abcl 1 est d ecrite dans [Briot 89] et [Briot 88] d etaille plusieurs types d extensions et exemples. 17 Nous remercions Pierre Abramovici, Fran cois Goret, Nicolas Graube, Chork Huat Ky, Marc LeBris, Sylvie Lemari e, Loic Lescaudron, et Gilles Moussion, pour leur participation active au projet. Nous remercions egalement Jean B ezivin, ....

J.-P. Briot, From Objects to Actors: Study of a Limited Symbiosis in Smalltalk-80, Rapport de Recherche LITP 88-58 RXF, Universite Pierre et Marie Curie, Paris, Septembre 1988.

....it: into Actalk. They are currently used to modularly change the semantics of the underlying Smalltalk 80 scheduler of processes, and design actor event driven representations (views) of actors (through a combination with our Actalk MVC interface) Their complete description is found in [Briot 88] 7.1 The Actor Model of Computation 7.1.1 The Concept of Behavior Replacement The Actor model of computation, as exposed in [Agha 86] replaces state change (assignment) with a much higher level concept: behavior change. When performing a message, the current behavior of an actor will specify ....

....the standard Smalltalk 80 programming environment. We now expect to explore many fields with this unified tool. We will attempt simulating more actor languages as extensions of the Actalk kernel. For instance, Actalk is currently being used as a designing tool for the Mering IV project [Ferber and Briot 88] We also plan the design of a higher level language, analog to Acore [Manning 87] with a compiler generating Actalk kernel code. A group of students is currently working on a general framework based on Smalltalk 80 MVC to visualize and control Actalk actors. Other prospective experiments with ....

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J.-P. Briot, From Objects to Actors: Study of a Limited Symbiosis in Smalltalk-80, Research Report LITP 88-58 RXF, Universit'e Pierre et Marie Curie, Paris, France, September 1988.

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