Which of the following sequences correctly implements this synchronization?
hard📝 Application Q8 of 15
FreeRTOS - Task Notifications
You want to synchronize two tasks using xTaskNotifyGive() as a lightweight semaphore. TaskA waits for a notification, and TaskB signals it. Which of the following sequences correctly implements this synchronization?
ABoth TaskA and TaskB call <code>xTaskNotifyGive()</code> simultaneously.
BTaskA calls <code>xTaskNotifyGive(TaskBHandle);</code> and TaskB calls <code>ulTaskNotifyTake(pdTRUE, portMAX_DELAY);</code>
CTaskA calls <code>ulTaskNotifyTake(pdTRUE, portMAX_DELAY);</code> and TaskB calls <code>xTaskNotifyGive(TaskAHandle);</code>
DTaskA and TaskB both call <code>ulTaskNotifyTake(pdTRUE, 0);</code> without notifications.
Step-by-Step Solution
Solution:
Step 1: Identify waiting task
TaskA should wait for the notification using ulTaskNotifyTake().
Step 2: Identify signaling task
TaskB signals TaskA by calling xTaskNotifyGive() with TaskA's handle.
Step 3: Verify options
TaskA calls ulTaskNotifyTake(pdTRUE, portMAX_DELAY); and TaskB calls xTaskNotifyGive(TaskAHandle); correctly matches this sequence. Others either reverse roles or misuse functions.
Final Answer:
TaskA calls ulTaskNotifyTake(pdTRUE, portMAX_DELAY); and TaskB calls xTaskNotifyGive(TaskAHandle); -> Option C
