Question: 2.9. It is common practice for programmers to create continuous test and loop code in order to poll I/O devices or wait for interrupts to

2.9. It is common practice for programmers to create continuous test and loop code in order to poll I/O devices or wait for interrupts to occur. Some processors provide an instruction (WAIT or HALT) that allows the processor to hibernate until an interrupt occurs. Why is the second form more efficient and desirable?

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