When TCP's slow timer expires every 500ms, tcp_slowtimo gets called.
当t cp的慢速计时器每隔500毫秒计时到期的时候,将调用tcp_slowtimo。
When the timer expires, the callback function (my_timer_callback) is invoked.
当计时器过期时,将调用回调函数my _ timer_callback。
Retransmission timer expires for a connection that is using the timer wheel algorithm.
一个使用计时器轮算法的连接的重新传输计时器计时到期。
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