PHPPM\ProcessManager::shutdown PHP Method

    public function shutdown()
    {
        if ($this->inShutdown) {
            return;
        }
        $this->inShutdown = true;
        //this method is also called during startup when something crashed, so
        //make sure we don't operate on nulls.
        $this->output->writeln('<error>Termination received, exiting.</error>');
        if ($this->controller) {
            @$this->controller->shutdown();
        }
        if ($this->web) {
            @$this->web->shutdown();
        }
        if ($this->loop) {
            $this->loop->tick();
            $this->loop->stop();
        }
        foreach ($this->slaves as $slave) {
            if (is_resource($slave['process'])) {
                proc_terminate($slave['process']);
            }
            if ($slave['pid']) {
                //make sure its dead
                posix_kill($slave['pid'], SIGKILL);
            }
        }
        exit;
    }