Assume that at time 5 no system resources are being used except for the processo

Question

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

Explanation / Answer

At time 22

P1 ,P3 ,P7 are blocked for I/O
P5 is running

At time 37:
P1,P3,P8 are running
P5 is blocked or suspend
P7 is blockked for I/O

At time 47:
P1,P3 are Running
P5 is Ready
P7 is blocked for I/O

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