An Abstract Model for Scheduling Real-Time Programs

Arenas, Alvaro

doi:10.1007/3-540-36103-0_22

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“…The interpretation of triggered events with counters in Event-B is an example of the inclusion of abstract scheduling in a specification, as advocated in [2]. Such techniques have been used in the past for modelling dynamic contraints in B [1] or to specify abstract scheduling of real-time programs [3].…”

Section: Schedulingmentioning

confidence: 99%

Towards Modelling Obligations in Event-B

Bicarregui

Arenas

Aziz

et al.

Lecture Notes in Computer Science

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We propose a syntactic extension of Event-B incorporating a limited notion of obligation described by triggers. The trigger of an event is the dual of the guard: when a guard is not true, an event must not occur, whereas when a trigger is true, the event must occur. The obligation imposed by a trigger is interpreted as a constraint on when the other events are permitted. For example, the simplest trigger next, which states that the event must be the next one to be executed when the trigger becomes true, is modelled as an extra guard on each of the other events which prohibits their execution at this time. In this paper we describe the modelling of triggers in Event-B, and analyse refinement and abstract scheduling of triggered events.

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Section: Schedulingmentioning

confidence: 99%