GATE | CS | 2019 | Operating System | Concurrency & Synchronization | Question 32

Consider three concurrent processes P1, P2 and P3 as shown below, which access a shared variable D that has been initialized to 100.

The processes are executed on a uniprocessor system running a time-shared operating system. If the minimum and maximum possible values of D after the three processes have completed execution are X and Y respectively, then the value of Y–X is __________.

Note: This was a numerical-type question.