code: public function dispatch()
      {
          pcntl_signal_dispatch();
  
          foreach ($this->signalQueue as $signal) {
              foreach ($this->handlers[$signal] as &$callable) {
                  call_user_func($callable, $signal);
              }
          }
  
          return $this;
      }
docs: Execute `pcntl_signal_dispatch` and process all registered handlers.
  
  @return $this