/**
* {@inheritdoc}
*
* @throws \Interop\Async\Loop\UnsupportedFeatureException If the pcntl extension is not available.
* @throws \RuntimeException If creating the backend signal handler fails.
*/
public function onSignal($signo, callable $callback, $data = null)
{
if (!$this->signalHandling) {
throw new UnsupportedFeatureException("Signal handling requires the pcntl extension");
}
return parent::onSignal($signo, $callback, $data);
}
/**
* {@inheritdoc}
*/
public function cancel($watcherIdentifier)
{
parent::cancel($watcherIdentifier);
unset($this->events[$watcherIdentifier]);
}
