GrumPHP\Process\AsyncProcessRunner::watchProcesses PHP Method

    private function watchProcesses()
    {
        foreach ($this->processes as $key => $process) {
            $isTerminated = $this->handleProcess($process);
            if ($isTerminated) {
                unset($this->processes[$key]);
            }
        }
        return count($this->processes) !== 0;
    }