Modular Baskets Queue

Abstract

A modular version of the baskets queue of Hoffman, Shalev and Shavit is presented. It manipulates the head and tail using a novel object called load-link/increment-conditional, which can be implemented using only READ/WRITE instructions, and admits implementations that spread contention. This suggests that there might be an alternative to the seemingly inherent bottleneck in previous queue implementations that manipulate the head and the tail using read-modify-write instructions over a single shared register.