Reusable resources EXample Consider two processes that compete for exclusive access to a disk file d and a tape drive t Process P Process Q Step Action Step Action Request D) Request (t) ppppppp Lock①D) Lock (T) Request t) Lock(T) qqqq Request (d) Lock①D) Perform function Perform function Unlock(D) Unlock(T) Unlock(T) Unlock D) Figure 6.4 Example of Two Processes Competing for Reusable Resources 1010 Reusable Resources Example • Consider two processes that compete for exclusive access to a disk file D and a tape drive T