Interrupts are central to operating systems as they provide an efficient way for the operating system to interact and react to its environment. The alternative is to have the operating system "watch" the various sources of input for events (polling) that require action—not a good use of CPU resources. Interrupt-based programming is directly supported by most CPUs. Interrupts provide a computer with a way of automatically running specific code in response to events. Even very basic computers support hardware interrupts, and allow the programmer to specify code which may be run when that event takes place.
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