Part 1
4 chapters
Foundations
Concurrency versus parallelism, the machine underneath — cores, SMT, cache, NUMA — time and deadlines, and threads in modern C++.
Doc 1
Concurrency vs Parallelism
The two independent axes of concurrency and parallelism, the four execution models that result, and how to measure them precisely.
Doc 2
The Machine Underneath
The hardware concurrency sits on top of: cores, simultaneous multithreading, cache coherence, NUMA topology, and the scheduler's context-switch cost.
Doc 3
Time, Timers, and Deadlines
The clock taxonomy a concurrent service actually needs, monotonic time, timeouts, and propagating a deadline across a call chain.
Doc 4
Threads in Modern C++
std::thread and std::jthread, cooperative cancellation with stop_token, and the lifetime and ownership rules that govern joining versus detaching.