Assume that at time 5 no system resources are being us and memory. Now consider the following events:
- At time 5: P1 executes a command to read from disk u
- At time 15: P5's time slice expires.
- At time 18: P7 executes a command to write to disk un
- At time 20: P3 executes a command to read from disk
- At time 24: P5 executes a command to write to disk un
- At time 28: P5 is swapped out.
- At time 33: An interrupt occurs from disk unit 2: P3's
- At time 36: An interrupt occurs from disk unit 3: P1's
- At time 38: P8 terminates.
- At time 40: An interrupt occurs from disk unit 3: P5's
- At time 44: P5 is swapped back in.
- At time 48: An interrupt occurs from disk unit 3: P7's
For each time 22, 37, and 47, identify which state each blocked, further identify the event on which is it blocked.