Memory Model

This one walks you through C++ and Rust memory models when you're writing lock-free code or trying to pick the right ordering for atomic operations. It covers the spectrum from relaxed to seq_cst, explains acquire-release semantics with concrete examples, and includes practical patterns like spinlocks and reference counting. The ordering decision tree is useful: it tells you when relaxed is enough versus when you need stronger guarantees. If you've ever stared at std::atomic documentation wondering whether you need acquire or release, or debugged a race that only shows up under load, this gives you the mental model to reason about it. The common mistakes section alone will save you from the volatile trap.