Abstract
SummaryWait‐freedom guarantees that all processes complete their operations in a finite number of steps regardless of the delay of any process. Combinatorial topology has been proposed in the literature as a formal verification technique to prove the wait‐free computability of decision tasks. Wait‐freedom is proved through the properties of a static topological structure that expresses all possible combinations of execution paths of the protocol solving the decision task. The practical application of combinatorial topology as a formal verification technique is limited because the existing theory only considers protocols in which the manner of communication between processes is through read‐write memory. This research proposes an extension to the existing theory, called the CAS‐extended model. The extended theory includes Compare‐And‐Swap (CAS) and Load‐Link/Store‐Conditional (LL/SC), which are atomic primitives used to achieve wait‐freedom in state‐of‐the‐art protocols. The CAS‐extended model theory can be used to formally verify wait‐free algorithms used in practice, such as concurrent data structures. We present new definitions detailing the construction of a protocol complex in the CAS‐extended model. As a proof‐of‐concept, we formally verify a wait‐free queue with three processes using the CAS‐extended combinatorial topology.
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