[Solved] In a system with tasks A (priority 3), B (priority 5), and C (priority 4), task B uses a mutex to protect a resource.... What problem can occur and how to fix it? | FreeRTOS

FreeRTOS - Task Priorities

In a system with tasks A (priority 3), B (priority 5), and C (priority 4), task B uses a mutex to protect a resource. Task A needs the same resource but has lower priority. What problem can occur and how to fix it?

AStarvation; fix by deleting task C

BDeadlock; fix by increasing task A priority

CNo problem; FreeRTOS handles all resource conflicts automatically

DPriority inversion; fix by using priority inheritance

Step-by-Step Solution

Solution:

Step 1: Identify problem
Task A (lower priority) holding mutex can block higher priority task B, causing priority inversion.
Step 2: Apply solution
Use priority inheritance to temporarily raise task A's priority while holding the mutex.
Final Answer:
Priority inversion; fix by using priority inheritance -> Option D
Quick Check:
Mutex + priority inversion = Use priority inheritance [OK]

Quick Trick: Use priority inheritance to solve priority inversion [OK]

Common Mistakes:

Ignoring priority inversion problem
Assuming FreeRTOS auto-fixes all mutex issues
Deleting unrelated tasks to fix resource conflicts

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What problem can occur and how to fix it?

Step 1: Identify problem

Step 2: Apply solution

Final Answer:

Quick Check:

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