We also saw in the task node example that nodes can represent wait states. 我们在任务节点的例子中看到了节点可以表示等待状态。
A method of interfacing with hardware that involves repeatedly reading a status register until the device has reached the awaited state. 一种硬件交互方法，不断读状态寄存器，直到设备进入等待状态。
