An Asynchronous Model of Locality, Failurem and Process Mobility

We present a model of distributed computation which is based on a fragment of the-calculus relying on asynchronous communication. We enrich the model with the following features: the explicit distribution of processes to locations, the failure of locations and their detection, and the mobility of processes. Our contributions are two folds. At the speciication level, we give a synthetic and exible formalization of the features mentioned above. At the veriication level, we provide original methods to reason about the bisimilarity of processes in the presence of failures. of distributed systems. Failures and failures' detection. Mobility of processes. Un moddle asynchrone de la localitt, l''chec et la mobilitt de processus RRsumm : Nous prrsentons un moddle de calcul rrparti qui est bass sur un fragment du-calcul avec communication asynchrone. Nous enrichissons le moddle pour reprrsenter la distribution explicite de processus locations, l''chec de locations et leur ddtection, et la mobilitt de processus. Au niveau de la spciication, nous prrsentons une formalisation synthhtique et exible des aspects mentionnns ci-dessus. Au niveau de la vriication, nous ddcrivons des methodes originales pour raisonner sur la bisimilaritt de processus en presence d''chec. Mots-cll :-calculus. Bisimulation. Communication asynchrone. Locations. Moddles de systtmes repartis. chec et ddtection d''chec. Mobilitt de processus.