CLAD Timing, Synchronization & Parallel Execution 2

Question 1

Which LabVIEW synchronization primitive stores every element sent in a FIFO buffer, ensuring no data is lost between parallel loops?

Accepted Answer

Queue

Answer

Queues implement a FIFO buffer so every element enqueued is preserved until explicitly dequeued, making them ideal for lossless data transfer between producer and consumer loops.

Question 2

What is the key behavioral difference between a Notifier and a Queue in LabVIEW?

Accepted Answer

A Notifier delivers only the most recent value to all listeners without buffering intermediate values

Answer

A Notifier replaces its stored value each time a new one is sent and broadcasts that latest value to all waiting listeners, so intermediate values sent before a listener reads can be lost.

Question 3

In LabVIEW, a Semaphore is primarily used to:

Accepted Answer

Control exclusive access to a shared resource and prevent race conditions

Answer

Semaphores implement mutual exclusion by allowing only one task at a time to acquire the semaphore, ensuring that critical sections accessing shared resources are not executed concurrently.

Question 4

The 'Rendezvous' synchronization primitive in LabVIEW is designed to:

Accepted Answer

Hold all participating tasks at a common synchronization point until every task arrives

Answer

A Rendezvous causes each registered task to block at the Wait on Rendezvous call until all expected tasks have arrived, after which all tasks are released simultaneously.

Question 5

In a Producer-Consumer architecture in LabVIEW, what is the primary role of the Queue connecting the two loops?

Accepted Answer

To decouple the production rate from the consumption rate by buffering elements

Answer

The Queue acts as a buffer between the loops, allowing the producer to enqueue data at its natural rate and the consumer to dequeue and process at a different rate without either loop blocking the other.

CLAD Practice Test

CLAD Practice Test

CLAD Timing, Synchronization & Parallel Execution 2