Synthesis of Fault - Tolerant Concurrent

Methods for mechanically synthesizing concurrent programs from temporal logic speciications have been proposed (cf. EC82, MW84, PR89, PR89b, AM94]). An important advantage of these synthesis methods is that they obviate the need to manually construct a program and compose a proof of its correctness. A serious drawback of these methods in practice, however, is that they produce concurrent programs for models of computation that are often unrealistic. In particular, all extant synthesis methods assume completely fault-free operation, i.e., the programs they produce are fault-intolerant. In this paper, we show how to mechanically synthesize fault-tolerant concurrent programs for various fault models. We illustrate the method by synthesizing fault-tolerant solutions to the mutual exclusion and barrier synchronization problems.