Abstract
We consider the time complexity of adaptive mutual exclusion algorithms, where “time” is measured by counting the number of remote memory references required per critical-section access. For systems that support (only) read, write, and comparison primitives (such as compare-and-swap), we establish a lower bound that precludes a deterministic algorithm with o(k) time complexity, where k is point contention. In particular, it is impossible to construct a deterministic O(log k) algorithm based on such primitives.
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