PHPDaemon\FS\FileSystem::waitAllEvents PHP Method

    public static function waitAllEvents()
    {
        if (!self::$supported) {
            return;
        }
        while (eio_nreqs()) {
            eio_poll();
        }
    }

 /**
  * Shutdown this worker
  * @param boolean Hard? If hard, we shouldn't wait for graceful shutdown of the running applications.
  * @return boolean|null Ready?
  */
 protected function shutdown($hard = false)
 {
     $error = error_get_last();
     if ($error) {
         if ($error['type'] === E_ERROR) {
             Daemon::log('W#' . $this->pid . ' crashed by error \'' . $error['message'] . '\' at ' . $error['file'] . ':' . $error['line']);
         }
     }
     if (Daemon::$config->logevents->value) {
         $this->log('event shutdown(' . ($hard ? 'HARD' : '') . ') invoked.');
     }
     if (Daemon::$config->throwexceptiononshutdown->value) {
         throw new \Exception('event shutdown');
     }
     @ob_flush();
     if ($this->terminated === true) {
         if ($hard) {
             exit(0);
         }
         return;
     }
     $this->terminated = true;
     if ($hard) {
         $this->setState(Daemon::WSTATE_SHUTDOWN);
         exit(0);
     }
     $this->reloadReady = $this->appInstancesReloadReady();
     if ($this->reload && $this->graceful) {
         $this->reloadReady = $this->reloadReady && microtime(TRUE) > $this->reloadTime;
     }
     if (Daemon::$config->logevents->value) {
         $this->log('reloadReady = ' . Debug::dump($this->reloadReady));
     }
     Timer::remove('breakMainLoopCheck');
     Timer::add(function ($event) {
         $self = Daemon::$process;
         $self->reloadReady = $self->appInstancesReloadReady();
         if ($self->reload === TRUE) {
             $self->reloadReady = $self->reloadReady && microtime(TRUE) > $self->reloadTime;
         }
         if (!$self->reloadReady) {
             $event->timeout();
         } else {
             $self->eventBase->exit();
         }
     }, 1000000.0, 'checkReloadReady');
     while (!$this->reloadReady) {
         $this->eventBase->loop();
     }
     FileSystem::waitAllEvents();
     // ensure that all I/O events completed before suicide
     exit(0);
     // R.I.P.
 }