Yes, unfortunately the threading primitives require libc. Ditto subprocesses. It's on my list.

But regarding: "Oops... apparently this is vibecoded. Welp, I just wasted ten minutes of my life reviewing slop that I'm not going to get back."

Do not talk to people like this. I don't care if you don't like the library, or if you found a flaw in it. I am a regular person who wrote this code for no other reason than I thought it would be good to exist. It's unbelievably rude to call it vibecoded slop, or a waste of your life, and it makes me sad that someone who would write an otherwise thoughtful comment would say something like that.