Yeah. I think I’ll end up having to do platform-specific ifdefs with either pthreads or threads.h, so I guess I may as well use the much better established pthreads and get macOS support by default. In fact, I just now learned that even glibc didn’t support C11 threads until 2018, according to this https://sourceware.org/bugzilla/show_bug.cgi?id=14092#c10

“DAMN! I ran the red light. But actually it wasn’t my fault, the light switched to yellow just as I was checking my rear mirror, I had no time to react by the time I glanced forward again. Oh well. It’s fine.”

– Maybe me.