_kern_send_signal
extern status_t _kern_send_signal(int32 id, uint32 signal,
error = _kern_send_signal(thread->id, sig, &userValue,
status = _kern_send_signal(pid, sig, NULL, 0);
return _kern_send_signal(thread, sig, NULL, SIGNAL_FLAG_SEND_TO_THREAD);
status_t error = _kern_send_signal(pid, signal, &userValue,