Retransmission timer expires for a connection for the first time or the fast retransmit phase is turned on.
连接的重新传输计时器首次计时到期,或者打开了快速重新传输阶段。
From a user's perspective, timer_list contains an expiration time, a callback function (when/if the timer expires), and a user-provided context.
从用户角度看,timer_list 包含一个过期时间,一个回调函数(当/如果计时器过期),以及一个用户提供的上下文。
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