Preemption Preemption is the act of temporarily inter nested multi-level t requiring its cooperation interrupts Hand ler 1 Handler 0) Task A Kernel-Level iret preemption cli switch preempt Task B Handler 1 Handler 1 cli switch iret iret s switch iret Preemptions and multi-level interrupts are indispensable to achieve real-time guarantees in rtos Preemptive os kernel is highly concurrent and complexPreemption Preemptions and multi-level interrupts are indispensable to achieve real-time guarantees in RTOS. Preemptive OS kernel is highly concurrent and complex. . . . . . . cli . . . switch . . . sti . . . Task A . . . sti Handler 1 iret. . . Handler 0 . . . . . . cli . . . switch . . . sti . . . Task B . . . cli . . . switch . . . iret . . . sti . . . eoi Handler 1 . . . iret iret. . . Handler 1 Kernel-Level preemption Preemption is the act of temporarily interrupting a task without requiring its cooperation. nested multi-level interrupts