I was reading about it and was thinking surely the queue first in first out system would make more sense than using a stack because the last instruction will become the first right because it's lifo?
2 Answers
The CPU does not store the instructions, it stores the instruction pointer, along with the state of the registers.
Think of putting a post-it in a book so you can get back to that page.
No. You have interrupts with same or different priorities. Interrupts with same priority will be handled in lifo order - but only one at a time. So that lifo queue would only ever have one entry. But with different priorities, a high priority interrupt can interrupt one with lower priority, so a stack is appropriate here.
answered Apr 1, 2021 at 10:36
