src/AbstractPool.php
public function shutdown($signal = SIGTERM)
    {
        foreach ($this->processes as $process) {
            if ($process->isRunning()) {
                $process->shutdown(true, $signal);
            }
        }
    }
public function shutdown($signal = SIGTERM)
    {
        foreach ($this->processes as $process) {
            if ($process->isRunning()) {
                $process->shutdown(true, $signal);
            }
        }
    }
public function shutdown ( $ signal = SIGTERM ) { foreach ( $ this -> processes as $ process ) { if ( $ process -> isRunning ( ) ) { $ process -> shutdown ( true , $ signal ) ; } } }
shutdown all process

@param int $signal
shutdown all process