Software interrupt required by processor - Operating System

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• Rahul saroj   -Posted on 14 Sep 19
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• Nirja Shah   -Posted on 23 Nov 15
  - The requirement of software interrupts is used by the CPU to obtain System services which need execution of privileged instructions.
  
  - It is caused either by an exceptional condition in the processor itself, or a special instruction in the instruction set which causes an interrupt when it is executed.
  
  - The former is often called a trap or exception and they are used for errors or events occurring during program execution that are exceptional enough that they cannot be handled within the program itself.
  
  - A high-priority condition requiring the interruption of the current code the processor is executing is alerted to the processor by an interrupt.
  
  - The processor responds by suspending its current activities, saving its state, and executing a function called an interrupt handler (or an interrupt service routine, ISR) to deal with the event.
  
  - This interruption is temporary, and, after the interrupt handler finishes, the processor resumes normal activities.

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