/**
* {@inheritdoc}
*/
public function create(int $signo, callable $callback, array $args = []) : SignalInterface
{
if (!isset($this->signals[$signo])) {
throw new InvalidSignalError(sprintf('Invalid signal number: %d.', $signo));
}
$signal = $this->factory->signal($this, $signo, $callback);
$this->signals[$signo]->attach($signal);
return $signal;
}
