3. Concurrency: Readers and Writers access a shared resource. There is mutual exclusion, except that multiple Readers can access the resource simultaneously, but not when a Writer is using it. Let us assume that reading takes 20 msec and writing takes 30 msec, and that Reader-1 tries to access the resource at time t=0 (initially, the resource is free). Then Writer-1 tries to access the resource at time t=5, and Reader-2 tries to access the resource at time t=10. When do these three threads start and terminate their use of the resource?

Answers: IDIS Reader-1 starts at 0 and ends at 20 msec Writer-1 starts at Reader-2 starts at and ends at and ends at msec msec