A Wait-Free Deque With Polylogarithmic Step Complexity

Authors Shalom M. Asbell , Eric Ruppert



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Author Details

Shalom M. Asbell
  • Department of Electrical Engineering and Computer Science, York University, Toronto, Canada
Eric Ruppert
  • Department of Electrical Engineering and Computer Science, York University, Toronto, Canada

Acknowledgements

We thank the anonymous reviewers for their detailed comments. This research was funded by the Natural Sciences and Engineering Research Council of Canada and a Lassonde Undergraduate Research Award.

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Shalom M. Asbell and Eric Ruppert. A Wait-Free Deque With Polylogarithmic Step Complexity. In 27th International Conference on Principles of Distributed Systems (OPODIS 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 286, pp. 17:1-17:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)
https://doi.org/10.4230/LIPIcs.OPODIS.2023.17

Abstract

The amortized step complexity of operations on all previous lock-free implementations of double-ended queues is linear in the number of processes. This paper presents the first concurrent double-ended queue where the amortized step complexity of each operation is polylogarithmic. Since a stack is a special case of a double-ended queue, this is also the first concurrent stack with polylogarithmic step complexity. The implementation is wait-free and the amortized step complexity is O(log² p + log q) per operation, where p is the number of processes and q is the size of the double-ended queue.

Subject Classification

ACM Subject Classification
  • Theory of computation → Data structures design and analysis
  • Theory of computation → Concurrent algorithms
Keywords
  • Lock-Free
  • Wait-Free
  • Double-Ended Queue
  • Deque
  • Stack
  • Space-Bounded
  • Polylogarithmic
  • Linearizable

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