Building a Coroutine based Job System without Standard Library
summary
Builds a coroutine-based job system using only C++20 language coroutines (no stdlib), a custom token/promise pair, a token dispatcher as initial_suspend, and a scheduler that enqueues lightweight jobs; uses a custom future plus a single-consumer event on Windows and MSVC for debugging. Demo runs a vaccine-sim with five labs (one finds vaccine that round) and prints per-second stats (~3,000 healthy initially). Shows lower allocation and removed bookkeeping, supports lazy jobs via deferred token, but profiler, thread-local assumptions, and tooling remain problematic.
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chapters (14)
- 0:00Introduction and background
- 1:12C++20 coroutines recap
- 10:02Coroutine mechanics deep dive
- 12:54Job system overview
- 17:33Token promise implementation
- 22:16Returning results from coroutines
- 24:49Sequential job execution
- 28:29Parallel job composition
- 30:35Lazy job scheduling
- 32:03Coroutine lifetime management
- 36:05System benefits and improvements
- 38:09Challenges and limitations
- 40:42Production readiness and learning curve
- 41:04Q&A session
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