Real-Time Scheduling Quiz

What is a primary feature of Rate Monotonic Scheduling (RMS)?

• Tasks are assigned priorities dynamically

• Tasks with shorter periods have higher priorities

• Tasks are scheduled based on execution time

• RMS does not allow preemption

Which of the following is a sufficient but not necessary condition for RMS schedulability?

• Task execution times are equal

• Tasks have harmonic periods

• CPU utilization is below the Liu & Layland bound

• Tasks have the same priority

What is the hyperperiod in scheduling analysis?

• The period of the task with the shortest period

• The least common multiple of all task periods

• The highest-priority task period

• The maximum execution time among tasks

Which factor most influences CPU utilization in RMS?

• Static priority assignments

• Execution times and periods of tasks

• The number of tasks

• Dynamic priority changes

Which condition can lead to priority inversion?

• Preemption of a lower-priority task

• A high-priority task blocked by a lower-priority task holding a shared resource

• Tasks having the same period

• Synchronization between tasks

What method can resolve priority inversion?

• Static priority assignment

• Dynamic scheduling

• Priority inheritance

• Increasing the task period

What type of interprocess communication avoids race conditions by eliminating shared memory access?

• Semaphores

• Mutexes

• Message passing

• Spinlocks

Which synchronization mechanism ensures mutual exclusion in real-time systems?

• Mutexes

• Non-blocking I/O

• Event flags

• Timers

In CMSIS-RTOS, which mechanism is used to block a task waiting on an external event?

• osSignalWait()

• osThreadYield()

• osKernelInitialize()

• osDelay()

What task state is entered when a task is ready but not executing?

• Idle

• Waiting

• Ready

• Terminated