Example
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 the (high) priority of H. As a result, M will be unable to preempt L and will be blocked. That is, the higher priority job M must wait for the critical section of the lower priority job L to be executed, because L now inherits the priority of H. When L exits its critical section, it regains its original (low) priority and awakens H (which was blocked by L). H, having high priority, immediately preempts L and runs to completion. This enables M and L to resume in succession and run to completion.
Read more about this topic: Priority Inheritance
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