Download the levi learning module leviRTS from the levi web site [497]. Model a job set as described in Table 4.1.

tP,P and t P,C are the times relative to the start times, at which a job requests exclusive use of the printer or the communication line, respectively (called ΔtP in levi). tV,P and tV,C are the times relative to the start times at which these resources are released. Use priority-based, preemptive scheduling! Which problem occurs? How can it be solved?

Table 4.1 Set of jobs requesting exclusive use of resources Job Priority Arrival Run-time Printer Comm line tp.ptv.p tp,c tv,c 1 1 1 2 4 6 1 1 (high) 3 4 J2 2 10 J3 3 5 J4 4 (low) 0 1 2 +367 1 4 1 5 I