[Solved] Given the code snippet:void vTask(void *pvParameters) { for(;;) { if(xSemaphoreTake(xSem, 0) == pdTRUE) { // Critical section xSemaphoreGive(xSem); } } }What is the likely problem with this code? | FreeRTOS

FreeRTOS - Debugging and Monitoring

Given the code snippet:

void vTask(void *pvParameters) {
  for(;;) {
    if(xSemaphoreTake(xSem, 0) == pdTRUE) {
      // Critical section
      xSemaphoreGive(xSem);
    }
  }
}

What is the likely problem with this code?

AIt causes a deadlock because the semaphore is never given

BIt causes a busy wait consuming CPU cycles

CIt will block indefinitely on xSemaphoreTake

DIt will cause a stack overflow

Step-by-Step Solution

Solution:

Step 1: Analyze semaphore take with zero block time
The call xSemaphoreTake(xSem, 0) tries to take the semaphore without waiting.
Step 2: Understand effect of zero block time in loop
If the semaphore is not available, the task loops immediately, causing busy waiting and high CPU usage.
Final Answer:
It causes a busy wait consuming CPU cycles -> Option B
Quick Check:
Busy wait due to zero block time = C [OK]

Quick Trick: Zero block time in loop causes busy wait [OK]

Common Mistakes:

Thinking it causes deadlock because semaphore is given
Assuming it blocks indefinitely with zero wait
Confusing busy wait with stack overflow

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More FreeRTOS Quizzes

Given the code snippet:

Step 1: Analyze semaphore take with zero block time

Step 2: Understand effect of zero block time in loop

Final Answer:

Quick Check:

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