Interpreter amie = sema.getThread(target);
if (amie == myself) {
throw new InterpreterException(StdErrors.An_actor_can_not_resume_himself);
}
if (amie != null) {
sema.resume(amie);
}
else{
throw new InterpreterException(StdErrors.extend(StdErrors.Actor_not_found,target));
}