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As a last step in a poll operation, all control blocks are cleaned up.
作为poll操作的最后一步，要清除所有控制块。
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Only control blocks that have been added to an event list are serviced.
只为已经添加到事件列表中的控制块提供服务。
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Only control blocks that have been added to an event list are serviced.
只为已经添加到事件列表中的控制块提供服务。
youdao