By Denis Caromel, Ludovic Henrio, Luca Cardelli
Deals an in depth assessment of concurrent languages and calculi, with complete figures and summaries. offers and analyses many implementation suggestions which can without difficulty be utilized by builders of disbursed platforms.
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Extra resources for A Theory of Distributed Objects
On the logical level, they have added concepts from the refinement calculus developed by Back and Kurki-Suonio. The individual specifications are given as modules in this Unity-like language. The specification style is operational, internal and external variables are distinguished by the module system. The method provides transformation rules that preserve all temporal properties of programs, even when applied to a module in isolation. The paper contains an outline of the necessary steps in the refinement proof for the memory component.
Thus, refinement corresponds 19 to logical implication. The paper distinguishes between time-independent and time-dependent specifications. A time-independent specification is based on untimed streams. A time-dependent specification employs timed streams and can express timing constraints and causalities. The paper deviates from the problem statement in that the handshake protocol is not imposed. This means for example that the user may send a new call before the memory component issues a reply to the previous call by the same user.
It asserts that, for every process p, every change to the returner's p a r t of the interface chip] is a Return(p, v) step for some value v. It is our specification of what it means for a returner component to obey the handshake protocol. Formula LegalReturner has no initial predicate because we have arbitrarily assigned the initial condition on the channel to the caller's specification. 6 Unlike LegalCaller, which requires t h a t the arguments be elements of Args, formula LegalReturner does not place any restriction on the results returned.
A Theory of Distributed Objects by Denis Caromel, Ludovic Henrio, Luca Cardelli