Writing a C++20M:N Scheduler from Scratch (EBR, Work-Stealing)
tiny_coro is a lightweight, educational M:N asynchronous runtime written from scratch using C++20 coroutines. It's designed to strip away the complexity of industrial libraries (like Seastar or Folly) to show the core mechanics clearly. Key Technical Features: M:N Scheduling: Maps M coroutines to N kernel threads (Work-Stealing via Chase-Lev deque). Memory Safety: Implements EBR (Epoch-Based Reclamation) to manage memory safely in lock-free structures without GC. Visualizations: I used Manim (the engine behind 3Blue1Brown) to create animations showing exactly how tasks are stolen and…
Writing a C++20M:N Scheduler from Scratch (EBR, Work-Stealing) launched on February 17, 2026 with 18 votes, #784 of 16,627 launches that month and more than 90% of that year's launches.
In plain words
tiny_coro is an educational M:N asynchronous runtime built from scratch in C++20 that demonstrates core scheduler mechanics through minimal code. It maps multiple coroutines to kernel threads using work-stealing queues and implements epoch-based reclamation for lock-free memory management without garbage collection. The project includes animated visualizations explaining task scheduling and execution. Designed for developers who want to understand how modern async runtimes work rather than just use them, the implementation keeps the core to roughly 1,000 lines of readable code.
written from the facts on this page · September 2026
From the sources
A lightweight, educational M:N asynchronous runtime built from scratch with C++20 Coroutines. Features Work-Stealing, EBR, and Reactor-based I/O. - lixiasky-back/tiny_coro-build_your_own_MN_scheduler
In the maker’s words, at launch
tiny_coro is a lightweight, educational M:N asynchronous runtime written from scratch using C++20 coroutines. It's designed to strip away the complexity of industrial libraries (like Seastar or Folly) to show the core mechanics clearly. Key Technical Features: M:N Scheduling: Maps M coroutines to N kernel threads…
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