umtxq_signal_mask
ret = umtxq_signal_mask(&key, args->val, args->val3);
ret += umtxq_signal_mask(&key2, nrwake, args->val3);
ret += umtxq_signal_mask(&key, nrwake, args->val3);
td->td_retval[0] = umtxq_signal_mask(&key, args->val, args->val3);
int umtxq_signal_mask(struct umtx_key *, int, u_int);