Lock-Free Queue in C++: A Deep Dive into Atomics and Memory Ordering
This article delves into the complexities of atomics and memory ordering in C++, culminating in a basic implementation of a lock-free queue. The author meticulously explains the indivisibility of atomic operations and the impact of different memory ordering models (relaxed, release-acquire, seq_cst) on concurrent programming, using illustrative examples to demonstrate how they prevent data races. A lock-free queue based on a linked list is then attempted, detailing the `enqueue` and `dequeue` operations. However, the author acknowledges the implementation's incompleteness, specifically its failure to address the ABA problem. The article is a comprehensive guide suitable for readers with some experience in concurrent C++ programming.