[Solved] You have two tasks: TaskA with priority 3 and TaskB with priority 5.... Which code snippet correctly achieves this?TaskHandle_t xTaskA, xTaskB; | FreeRTOS

FreeRTOS - Task Priorities

You have two tasks: TaskA with priority 3 and TaskB with priority 5. You want TaskA to temporarily run with higher priority than TaskB during a critical section. Which code snippet correctly achieves this?

TaskHandle_t xTaskA, xTaskB;
// Initially priorities: TaskA=3, TaskB=5
// Critical section starts
_____;
// Critical section ends
vTaskPrioritySet(xTaskA, 3);

AvTaskPrioritySet(xTaskA, 6);

BvTaskPrioritySet(xTaskB, 2);

CvTaskPrioritySet(xTaskA, 5);

DvTaskPrioritySet(xTaskB, 3);

Step-by-Step Solution

Solution:

Step 1: Identify priority requirements
TaskA must have higher priority than TaskB (which is 5) during the critical section.
Step 2: Choose correct priority change
Setting TaskA to 6 makes it higher than TaskB's 5. Options A and D lower TaskB's priority instead. vTaskPrioritySet(xTaskA, 5); sets TaskA to 5, equal to TaskB, not higher.
Step 3: Restore original priority after critical section
After the critical section, TaskA's priority is reset to 3 as shown.
Final Answer:
vTaskPrioritySet(xTaskA, 6); -> Option A
Quick Check:
TaskA priority > TaskB priority during critical section [OK]

Quick Trick: Raise TaskA priority above TaskB, then restore after [OK]

Common Mistakes:

Setting TaskA priority equal to TaskB
Lowering TaskB priority instead of raising TaskA
Not restoring original priority after critical section

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Which code snippet correctly achieves this?

Step 1: Identify priority requirements

Step 2: Choose correct priority change

Step 3: Restore original priority after critical section

Final Answer:

Quick Check:

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