Interrupts
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May 1, 2024
Updated May 10, 2025
17 minute read
Understanding Interrupts: A Core Concept in Computing
In the realm of computing, an "interrupt" is a signal to the processor that an event has occurred which requires immediate attention. This signal can originate from hardware or software, and its effect is to pause the processor's current activities, save its state, and then execute a special routine called an interrupt handler (or Interrupt Service Routine - ISR) to deal with the event. Once the interrupt has been serviced, the processor can usually resume its original task as if nothing happened, though some interrupts might signify critical errors that halt the system. Think of it like a doorbell ringing while you're focused on a task; you pause what you're doing, answer the door, and then (usually) return to your task.
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