In scheduling When a high priority task is preempted by a lower priority task, is called as priority inversion and is a problematic scenario, effectively “inverting” the relative priorities of the two tasks, violating the priority model that high priority tasks can only be prevented from running by higher priority tasks and briefly by low priority tasks nearly about to …
What is priority inheritance?
Consider three jobs: Job Name Priority H High M Medium L Low Suppose H is blocked by L for some shared resource. The priority inheritance protocol requires that L executes its critical section at H’s (high) priority. As a result, M will be unable to preempt L and will be blocked. That is, the higher-priority job M must wait for …
What is spin lock?
Locks are used in operating system to reserve critical section resources for mutual exclusion. Suppose a task is running and a little time (execution time) is left for its completion, That is: The running time left for it is less compared to the time that would be taken in blocking it and context switching. Under this situation it is not …