Function pthread_create 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pthread_create(
    pthread: *mut pthread_t,
    attr: *const pthread_attr_t,
    start_routine: extern "C" fn(arg: *mut c_void) -> *mut c_void,
    arg: *mut c_void,
) -> c_int

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