[Solved] Consider the following code snippet: void Task1(void *pvParameters) { // Wait for notification ulTaskNotifyTake(pdTRUE, portMAX_DELAY);... } What will be printed when Task2 calls xTaskNotifyGive()? | FreeRTOS

FreeRTOS - Task Notifications

Consider the following code snippet:

void Task1(void *pvParameters) {
    // Wait for notification
    ulTaskNotifyTake(pdTRUE, portMAX_DELAY);
    // Continue after notification
    printf("Task1 resumed\n");
}

void Task2(void *pvParameters) {
    // Notify Task1
    xTaskNotifyGive(Task1Handle);
}

What will be printed when Task2 calls xTaskNotifyGive()?

ATask2 resumes instead of Task1

BTask1 resumed

CSyntax error at compile time

DNo output, Task1 blocks forever

Step-by-Step Solution

Solution:

Step 1: Understand notification flow
Task1 waits for a notification with ulTaskNotifyTake(). When Task2 calls xTaskNotifyGive(), it sends the notification.
Step 2: Effect of notification
The notification unblocks Task1, so it prints "Task1 resumed".
Final Answer:
Task1 resumed -> Option B
Quick Check:
Notification received = Task1 prints [OK]

Quick Trick: xTaskNotifyGive() wakes waiting task to continue [OK]

Common Mistakes:

Assuming Task1 never resumes
Confusing which task prints output
Thinking code causes compile error

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More FreeRTOS Quizzes

Consider the following code snippet:

Step 1: Understand notification flow

Step 2: Effect of notification

Final Answer:

Quick Check:

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