Ze is C, the missing C runtime
Background
This library was initially a rework/refactor and merge of libco with minicoro. These two differ among many coru, libdill, libmill, libwire, libcoro, libcsp, dyco-coroutine, in that Windows is supported, and not using ucontext. That was until I came across libtask, where the design is the underpinning of GoLang, and made it Windows compatible in an fork symplely/libtask. Libtask has it's channel design origins from Richard Beton's libcsp
You can read Fibers, Oh My! for a breakdown on how the actual context switch here is achieved by assembly. This library incorporates libuv in a way that make providing callbacks unnecessary, same as in Using C++ Resumable Functions with Libuv. Libuv is handling any hardware or multi-threading CPU access. This not necessary for library usage, the setup can be replaced with some other Event Loop library, or just disabled. There is a unmaintained libasync package tried combining libco, with libuv too, Linux only.