ITPEC FE Subject A October 2024 Question 14
ITPEC FE Subject A October 2024 — Question 14 of 60
Preemptive Priority Scheduling — higher-priority task immediately preempts a running lower-priority task.
A has higher priority than B. When A is launched during B's execution:
- •B is moved to ready state (not waiting)
- •A starts executing immediately
Why not others:
- (b) Says B goes to "waiting state" — wrong; preemption puts a task into ready, not waiting
- (c) B preempts A — impossible since A has higher priority
- (d) B preempts A — same issue as (c)
Key rule: Ready state = waiting for CPU only. Waiting state = blocked on I/O or resource. Preempted processes always go to ready state.
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