Async runtimes and coroutines
chatterd v4 tells the same broadcast three async ways over the same OS threads: hand-rolled C++20 coroutines suspending on an epoll reactor, Go's G-M-P scheduler and netpoller that needed no rewrite, and tokio's tasks-and-Wakers — with /proc/
This chapter has moved. The C++ concurrency material has its own dedicated, runnable book: C++ Concurrency and Parallelism.
It maps to Async Runtimes and Event Loops there.
The full, runnable C++ treatment of concurrency and parallelism — threads and jthread, mutexes and the memory model, atomics and lock-free structures, futures and coroutines, fibers, Asio, NUMA and mechanical sympathy, and the low-latency patterns — now lives in that book, each chapter with a Docker or KVM-lab demo and a Lua verify.lua behind it. This book keeps its Linux systems-programming material; the C++ concurrency compendium was extracted so it could grow on its own.