1. C. Varela and G. Agha. A Hierarchical Model for Coordination of Concurrent Activities. In P. Ciancarini and A. Wolf, editors, Third International Conference on Coordination Languages and Models (COORDINATION '99), LNCS 1594, Berlin, pages 166-182, April 1999. Springer-Verlag. Keyword(s): concurrent programming, coordination models. Abstract:

   We describe a hierarchical model for coordination of concurrent activities based on grouping actors into casts and coordinating casts by actors that are designated directors. The hierarchical model provides a simple, intuitive basis for actor communication and coordination. Casts serve as abstraction units for naming, migration, synchronization and load balancing. Messengers are actors used to send messages with special behaviour across casts. Moreover, an implementation of the hierarchical model does not require a reflective run-time architecture. We present the operational semantics for our model and illustrate the model by two sample applications: an atomic multicast protocol and a messenger carrying remote exception-handling code. These applications have been implemented in Java, leveraging the existence of cross-platform, safe virtual machine implementations.

   
   

   @InProceedings{varela-agha-coordination-99,
   author = {C. Varela and G. Agha},
   title = {{A Hierarchical Model for Coordination of Concurrent Activities}},
   booktitle = {Third International Conference on Coordination Languages and Models (COORDINATION '99)},
   year = 1999,
   month = {April},
   editor = "P. Ciancarini and A. Wolf",
   series = {LNCS 1594},
   address = {Berlin},
   publisher = {Springer-Verlag},
   pages = {166--182},
   ps = {http://web.archive.org/web/20010404065326/http://osl.cs.uiuc.edu/Papers/Coordination99.ps},
   keywords = {concurrent programming, coordination models},
   abstract = {We describe a hierarchical model for coordination of concurrent activities based on grouping actors into casts and coordinating casts by actors that are designated directors. The hierarchical model provides a simple, intuitive basis for actor communication and coordination. Casts serve as abstraction units for naming, migration, synchronization and load balancing. Messengers are actors used to send messages with special behaviour across casts. Moreover, an implementation of the hierarchical model does not require a reflective run-time architecture. We present the operational semantics for our model and illustrate the model by two sample applications: an atomic multicast protocol and a messenger carrying remote exception-handling code. These applications have been implemented in Java, leveraging the existence of cross-platform, safe virtual machine implementations.} 
   }
   

1. C. Varela and G. Agha. Linguistic Support for Actors, First-Class Token-Passing Continuations and Join Continuations. Proceedings of the Midwest Society for Programming Languages and Systems Workshop, October 1999. Keyword(s): concurrent programming, internet programming languages.
   

   @Misc{varela-agha-salsa-99,
   author = {C. Varela and G. Agha},
   title = {{Linguistic Support for Actors, First-Class Token-Passing Continuations and Join Continuations}},
   howpublished = {Proceedings of the Midwest Society for Programming Languages and Systems Workshop},
   month = {October},
   year = 1999,
   url = {http://web.archive.org/web/20010404065326/http://osl.cs.uiuc.edu/~cvarela/mspls99/},
   keywords = "concurrent programming, internet programming languages" 
   }
   

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