Fig. $1$ depicts an example time sequence of multiple interrupts while Table $1$ lists the execution

times of the user program and service routines in the case that they run to the completion without

being interrupted at all. Based on Fig. $1$ and Table $1,$ specify how much time is needed for each

program to run to the end by filling Table $2($Please ignore all other unmentioned overheads for the

execution times$).(20$p$)$

Figure $1$: Example time sequence $($Src: Computer Org. and Arch., Stallings$)$

Table $1.$ Execution times without interrupts

Table $2.$ Actual execution times