Adding fault-tolerance using pre-synthesized components

We present a hybrid synthesis method for automatic addition of fault-tolerance to distributed programs. In particular, we automatically specify and add pre-synthesized fault-tolerance components to programs in the cases where existing heuristics fail to add fault-tolerance. Such addition of pre-synthesized components has the advantage of reusing pre-synthesized fault-tolerance components in the synthesis of different programs, and as a result, reusing the effort put in the synthesis of one program for the synthesis of another program. Our synthesis method is sound in that the synthesized fault-tolerant program satisfies its specification in the absence of faults, and provides desired level of faulttolerance in the presence of faults. We illustrate our synthesis method by adding pre-synthesized components with linear topology to a token ring program that tolerates the corruption of all processes. Also, we have reused the same component in the synthesis of a fault-tolerant alternating bit protocol. Elsewhere, we have applied this method for adding presynthesized components with hierarchical topology

SAVCBS 2004 Specification and Verification of Component-Based Systems: Workshop Proceedings

This is the proceedings of the 2004 SAVCBS workshop. The workshop is concerned with how formal (i.e., mathematical) techniques can be or should be used to establish a suitable foundation for the specification and verification of component-based systems. Component-based systems are a growing concern for the software engineering community. Specification and reasoning techniques are urgently needed to permit composition of systems from components. Component-based specification and verification is also vital for scaling advanced verification techniques such as extended static analysis and model checking to the size of real systems. The workshop considers formalization of both functional and non-functional behavior, such as performance or reliability