The C standard library has had <threads.h> since C11 https://www.cppreference.com/c/thread https://www.cppreference.com/c/thread and there are now a nonzero num

The C standard library has had <threads.h> since C11 https://www.cppreference.com/c/thread https://www.cppreference.com/c/thread and there are now a nonzero number of systems that support it! (glibc, musl, maybe others?)