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Questions and Answers

What is the range of the returned count when a counting semaphore is fully taken?

1 to (uxMaxCount-1)
1 to uxMaxCount
0 to uxMaxCount (correct)
0 to (uxMaxCount-1)

What is the purpose of the 'notification' mechanism in FreeRTOS?

Alternative to binary semaphores with lower memory usage (correct)
Alternative to binary semaphores with higher overhead
Provide a private value for each task
Allow multiple tasks to block on one notification

How does a counting semaphore signal availability?

Returned count of 0
Returned count less than 0
Returned count equal to uxMaxCount
Returned count greater than 0 (correct)

How does FreeRTOS handle context switch in ISR?

Context switch only when notification value changes (A) Signup and view all the answers

What happens if xSemaphoreTake returns pdTRUE?

Semaphore is taken and needs to be released (D) Signup and view all the answers

What does the private 32-bit 'notification value' do in FreeRTOS tasks?

Used for blocking and unblocking tasks (D) Signup and view all the answers

What is the purpose of the function uxTaskPriorityGet in FreeRTOS?

Obtains the current priority of a task (C) Signup and view all the answers

In FreeRTOS, what happens if NULL is passed as the parameter in vTaskPrioritySet?

Changes the priority of the calling task (A) Signup and view all the answers

Which function in FreeRTOS is used to change the priority of a task?

vTaskPrioritySet (B) Signup and view all the answers

What does xQueueCreate do in FreeRTOS?

Creates a queue for storing items in FIFO order (D) Signup and view all the answers

When handling an ISR context switch in FreeRTOS, what is the significance of Critical Sections?

Guarantees thread safety (C) Signup and view all the answers

What is the consequence of passing an invalid handle to vTaskPrioritySet in FreeRTOS?

Results in undefined behavior (B) Signup and view all the answers

In FreeRTOS, what is a weakness related to an undefined pointer value while setting a task's priority?

No simple test to avoid this issue (D) Signup and view all the answers

Which function in FreeRTOS changes the priority of a task to a specified value?

'vTaskPrioritySet' (C) Signup and view all the answers

'vTaskPrioritySet' should not be called with NULL as its first parameter unless:

'uxNewPriority' is set to current priority (B) Signup and view all the answers

'uxTaskPriorityGet' returns undefined for any argument except when:

'pxTask' is NULL (B) Signup and view all the answers