vyants\daemon\DaemonController::loop PHP Method

    private final function loop()
    {
        if (file_put_contents($this->getPidPath(), getmypid())) {
            $this->parentPID = getmypid();
            \Yii::trace('Daemon ' . $this->getProcessName() . ' pid ' . getmypid() . ' started.');
            while (!self::$stopFlag) {
                if (memory_get_usage() > $this->memoryLimit) {
                    \Yii::trace('Daemon ' . $this->getProcessName() . ' pid ' . getmypid() . ' used ' . memory_get_usage() . ' bytes on ' . $this->memoryLimit . ' bytes allowed by memory limit');
                    break;
                }
                $this->trigger(self::EVENT_BEFORE_ITERATION);
                $this->renewConnections();
                $jobs = $this->defineJobs();
                if ($jobs && !empty($jobs)) {
                    while (($job = $this->defineJobExtractor($jobs)) !== null) {
                        //if no free workers, wait
                        if ($this->isMultiInstance && count(static::$currentJobs) >= $this->maxChildProcesses) {
                            \Yii::trace('Reached maximum number of child processes. Waiting...');
                            while (count(static::$currentJobs) >= $this->maxChildProcesses) {
                                sleep(1);
                                pcntl_signal_dispatch();
                            }
                            \Yii::trace('Free workers found: ' . ($this->maxChildProcesses - count(static::$currentJobs)) . ' worker(s). Delegate tasks.');
                        }
                        pcntl_signal_dispatch();
                        $this->runDaemon($job);
                    }
                } else {
                    sleep($this->sleep);
                }
                pcntl_signal_dispatch();
                $this->trigger(self::EVENT_AFTER_ITERATION);
            }
            \Yii::info('Daemon ' . $this->getProcessName() . ' pid ' . getmypid() . ' is stopped.');
            return self::EXIT_CODE_NORMAL;
        }
        $this->halt(self::EXIT_CODE_ERROR, 'Can\'t create pid file ' . $this->getPidPath());
    }