Each task tracks its runtime, and tasks are enqueued on that value.
每个任务都跟踪它的运行时，并根据该值对任务进行排队。
Packets are enqueued for transmission and dequeued by the device driver.
数据包是由设备驱动进行入队传输和出队。
If necessary, a waiting thread is signaled to pick up the newly enqueued object.
如果需要，则通知等待线程选取刚刚进入队列的对象。
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