Function pthread_condattr_setclock 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pthread_condattr_setclock(
    condattr: *mut pthread_condattr_t,
    clock: clockid_t,
) -> c_int

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