Busy Dev's Checklist for Lock-Free Data Structures in C++
Lock-free data structures are a powerful tool in system programming, but they come with a steep learning curve. This checklist is for the busy developer who needs a practical, no-nonsense guide to designing, implementing, and maintaining lock-free code in C++. We'll cover the core concepts, common pitfalls, and decision criteria to help you avoid the most expensive mistakes. 1. Where Lock-Free Shows Up in Real Work Lock-free data structures appear in high-performance systems where contention is high and latency must be predictable. Think of network routers processing millions of packets per second, real-time trading systems, game engines, or database transaction logs. In these environments, a lock can become a bottleneck that destroys throughput or introduces unacceptable jitter. The fundamental promise is that no thread ever blocks waiting for another. Instead, threads retry operations until they succeed. This eliminates problems like priority inversion, convoying, and deadlock that plague lock-based designs.