No matter what language you are using, concurrency happens in instructions, interrupts, cores, caches, devices, virtual memory mechanisms, etc, not even getting

No matter what language you are using, concurrency happens in instructions, interrupts, cores, caches, devices, virtual memory mechanisms, etc, not even getting into GPU architecture. In C you have direct control over these things, you can make the system as concurrent as you want. In Javascript you have a little window into this through whatever the layer below provided you. So Javascript by definition has a (small) subset of the concurrency you can get in a systems language. And no I'm not entirely sure what you're talking about. It sounds like you learned concurrency in Javascript, and define concurrency in terms of Javascript primitives. But that's merely a guess on my part.