DATA (high priority) completes at time 450 (WCRT = 175) and cannot met its deadline (=125) due to priority inversion

- FORECAST (low priority) locks the data at time 225 and is preempted at time 275 by VIDEO and RADIO. Notice 
that FORECAST preemption by SCHED_BUS at time 250 is a normal behavoir.
- VIDEO and RADIO (medium priority) do not use the shared data.
- Then, VIDEO and RADIO indirecly block DATA as they block FORECAST
- Finally, DATA completes at time 450 (WCRT = 175) and cannot met its deadline (=125)


- By activating PCP, VIDEO and RADIO do not delayed
FORECAST anymore, which permits DATA to meet its deadline