关于session 的 redis 实现问题，目前参考了ci和laravel 的实现，有些疑问？

1.laravel
看了文档，文档中使用的是 predis 这个包，实现 session redis handel 地址：
github.com/predis/predis/blob/v1.1...

    /**
     * {@inheritdoc}
     * @return bool
     */
    #[\ReturnTypeWillChange]
    public function write($session_id, $session_data)
    {
        $this->client->setex($session_id, $this->ttl, $session_data);

        return true;
    }

实现起来有点简单，setnx 都不判断返回值的么？

2.ci
自带session redis handel 地址
github.com/codeigniter4/CodeIgnite...

    /**
     * Acquires an emulated lock.
     *
     * @param string $sessionID Session ID
     */
    protected function lockSession(string $sessionID): bool
    {
        // PHP 7 reuses the SessionHandler object on regeneration,
        // so we need to check here if the lock key is for the
        // correct session ID.
        if ($this->lockKey === $this->keyPrefix . $sessionID . ':lock') {
            return $this->redis->expire($this->lockKey, 300);
        }

        $lockKey = $this->keyPrefix . $sessionID . ':lock';
        $attempt = 0;

        do {
            if (($ttl = $this->redis->ttl($lockKey)) > 0) {
                sleep(1);

                continue;
            }

            if (! $this->redis->setex($lockKey, 300, (string) time())) {
                $this->logger->error('Session: Error while trying to obtain lock for ' . $this->keyPrefix . $sessionID);

                return false;
            }

            $this->lockKey = $lockKey;
            break;
        } while (++$attempt < 30);

        if ($attempt === 30) {
            log_message('error', 'Session: Unable to obtain lock for ' . $this->keyPrefix . $sessionID . ' after 30 attempts, aborting.');

            return false;
        }

        if ($ttl === -1) {
            log_message('debug', 'Session: Lock for ' . $this->keyPrefix . $sessionID . ' had no TTL, overriding.');
        }

        $this->lock = true;

        return true;
    }

注意，lockSession 方法里的 sleep?
这是啥，这里有个问题，相同session的并发请求，会造成1s上的延迟，这是啥？（这里sleep我们团队直接改成100ms了）
争议连接：github.com/bcit-ci/CodeIgniter/pul...

就感觉这两种实现方式，都有点奇怪，有没有大佬说下?
我准备再去看看其他框架的实现，大家一起沟通下