The following are some events that occur after a device controller iss...
The correct order in which the events occur after a device controller issues an interrupt while process L is under execution is QPTRS.
Explanation:
1. Q: The processor finishes the execution of the current instruction.
- When an interrupt occurs, the processor completes the current instruction it is executing before handling the interrupt.
2. P: The processor pushes the process status of L onto the control stack.
- After completing the current instruction, the processor saves the process status of process L onto the control stack. This allows the processor to resume the execution of process L once the interrupt is handled.
3. T: The processor loads the new PC value based on the interrupt.
- After saving the process status, the processor determines the new PC (Program Counter) value based on the interrupt. The PC value indicates the next instruction to be executed.
4. R: The processor executes the interrupt service routine.
- The processor then executes the interrupt service routine, which is a specific set of instructions that handle the interrupt. The interrupt service routine is responsible for performing the necessary actions related to the interrupt.
5. S: The processor pops the process status of L from the control stack.
- Once the interrupt service routine is completed, the processor retrieves the process status of process L from the control stack. This allows the processor to resume the execution of process L from where it was interrupted.
Therefore, the correct order of events is QPTRS. The processor finishes the current instruction (Q), pushes the process status onto the control stack (P), loads the new PC value based on the interrupt (T), executes the interrupt service routine (R), and pops the process status from the control stack (S).
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