[Solved] Consider this simplified watchdog task code snippet in FreeRTOS:void WatchdogTask(void *pvParameters) { for... } } }What happens if the monitored task never calls xSemaphoreGive(watchdogSemaphore)? | FreeRTOS

FreeRTOS - Design Patterns for RTOS

Consider this simplified watchdog task code snippet in FreeRTOS:

void WatchdogTask(void *pvParameters) {
    for (;;) {
        if (xSemaphoreTake(watchdogSemaphore, pdMS_TO_TICKS(1000)) == pdFALSE) {
            // No reset signal received
            vTaskDelay(pdMS_TO_TICKS(500));
            // Take recovery action
        } else {
            // Reset signal received
            vTaskDelay(pdMS_TO_TICKS(100));
        }
    }
}

What happens if the monitored task never calls xSemaphoreGive(watchdogSemaphore)?

AThe watchdog task will detect no reset signal and take recovery action repeatedly

BThe watchdog task will keep waiting forever without action

CThe watchdog task will crash due to semaphore misuse

DThe watchdog task will reset the semaphore automatically

Step-by-Step Solution

Solution:

Step 1: Analyze semaphore wait behavior
The watchdog task waits 1000 ms for a semaphore signal. If none arrives, xSemaphoreTake returns pdFALSE.
Step 2: Understand the consequence of no signal
When no signal is received, the watchdog delays 500 ms and then takes recovery action repeatedly in the loop.
Final Answer:
The watchdog task will detect no reset signal and take recovery action repeatedly -> Option A
Quick Check:
No semaphore signal triggers recovery = A [OK]

Quick Trick: No semaphore signal means watchdog triggers recovery [OK]

Common Mistakes:

Assuming watchdog waits forever without action
Thinking semaphore misuse causes crash here
Believing semaphore resets automatically

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More FreeRTOS Quizzes

Consider this simplified watchdog task code snippet in FreeRTOS:

Step 1: Analyze semaphore wait behavior

Step 2: Understand the consequence of no signal

Final Answer:

Quick Check:

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