Preventing Cron Job Collision (File system lock file - Laravel indatus/dispatcher)

gistfile1.txt

public function fire()
	{
	 //// Preventing Cron Job Collision
	 $file = "/var/www/tick/cronlock";
	 $fp = fopen($file, 'r+');
	 if(!flock($fp, LOCK_EX | LOCK_NB)) {
	    $this->error('Cron is already running another task...');
	    exit(-1);
	 }
		
                // Do MANY MANY STAFF
                sleep(5);
		$this->info('Done doing stuff!');

	 fclose($fp);
	}