Function thrd_create 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn thrd_create(
    thrd: *mut thrd_t,
    start: thrd_start_t,
    arg: *mut c_void,
) -> c_int

See https://pubs.opengroup.org/onlinepubs/9799919799/functions/thrd_create.html.