擅长:python、mysql、java
<p>维基百科关于<a href="https://en.wikipedia.org/wiki/Polling_(computer_science)" rel="nofollow noreferrer">Polling</a>的文章将其定义为:</p>
<blockquote>
<p>Actively sampling the status of an external device by a client program as a synchronous activity.</p>
</blockquote>
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<p>在您的代码中,这意味着它会定期(每200ms)检查SSH连接是否有任何传入数据和输出队列中的空闲容量</p>