Function pthread_attr_setstacksize 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pthread_attr_setstacksize(
    attr: *mut pthread_attr_t,
    stacksize: size_t,
) -> c_int

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