think\Process::updateStatus PHP Method

    protected function updateStatus($blocking)
    {
        if (self::STATUS_STARTED !== $this->status) {
            return;
        }
        $this->processInformation = proc_get_status($this->process);
        $this->captureExitCode();
        $this->readPipes($blocking, '\\' === DS ? !$this->processInformation['running'] : true);
        if (!$this->processInformation['running']) {
            $this->close();
        }
    }