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to happen. Although rescheduling the same task over and over might appear to be a pointless operation, it is sometimes useful. For example, it can be used to implement the polling of devices. Therefore, a timer that reregisters itself uglys book pdf 2011 runs on the same CPU. An important feature of timers that should not be forgotten, ug,ys, is that they are a potential source of race conditions, even on uniprocessor systems.