FreeRTOS - Task Priorities
In a system with priority inheritance enabled, what happens if vTaskPrioritySet() lowers the priority of a task currently holding a mutex?
In a system with priority inheritance enabled, what happens if vTaskPrioritySet() lowers the priority of a task currently holding a mutex?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand priority inheritance
Priority inheritance temporarily raises a task's priority if it holds a mutex needed by higher priority tasks.Step 2: Effect of lowering priority with vTaskPrioritySet()
Even if priority is lowered, the task's priority is boosted to prevent priority inversion until mutex is released.Final Answer:
The task's priority is temporarily boosted to avoid priority inversion -> Option BQuick Check:
Priority inheritance overrides lowered priority [OK]
Quick Trick: Priority inheritance prevents priority inversion [OK]
Common Mistakes:
- Assuming immediate mutex loss
- Thinking system deadlocks
- Believing priority change is ignored
Master "Task Priorities" in FreeRTOS
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