Lock-free linked lists and skip lists

  • Authors:
  • Mikhail Fomitchev;Eric Ruppert

  • Affiliations:
  • York University;York University

  • Venue:
  • Proceedings of the twenty-third annual ACM symposium on Principles of distributed computing
  • Year:
  • 2004

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Abstract

Lock-free shared data structures implement distributed objects without the use of mutual exclusion, thus providing robustness and reliability. We present a new lock-free implementation of singly-linked lists. We prove that the worst-case amortized cost of the operations on our linked lists is linear in the length of the list plus the contention, which is better than in previous lock-free implementations of this data structure. Our implementation uses backlinks that are set when a node is deleted so that concurrent operations visiting the deleted node can recover. To avoid performance problems that would arise from traversing long chains of backlink pointers, we introduce flag bits, which indicate that a deletion of the next node is underway. We then give a lock-free implementation of a skip list dictionary data structure that uses the new linked list algorithms to implement individual levels. Our algorithms use the single-word C&S synchronization primitive.