Proving Atomicity: An Assertional Approach

Atomicity (or linearizability) is a commonly used consistency criterion for distributed services and objects. Although atomic object implementations are abundant, proving that algorithms achieve atomicity has turned out to be a challenging problem. In this paper, we initiate the study of systematic ways of verifying distributed implementations of atomic objects, beginning with read/write objects (registers). Our general approach is to replace the existing operational reasoning about events and partial orders with assertional reasoning about invariants and on relations. To this end, we define an abstract state machine that captures the atomicity property and prove correctness of the object implementations by establishing a simulation mapping between the implementation and the specification automata. We demonstrate the generality of our specification by showing that it is implemented by three different read/write register constructions: the message-passing register emulation of Attiy...

• Type: Conference
• Year: 2005
• Where: WDAG
• Authors: Gregory Chockler, Nancy A. Lynch, Sayan Mitra, Joshua A. Tauber
• Keywords: Algorithms, Atomic Object, Atomic Object Implementations, Object Implementations, WDAG 2005