Question

Which of the process transition is invalid? (a) run ready (b) suspend wait suspend ready (c) wait/ block run (d) none of the above

Answer 1

Answer : - 'Wait to Run' is invalid state transition.

Following are the valid state transitions:-

1) Start -> Ready

2) Ready -> Running

3) Running -> Ready

4) Running -> Terminated

5) Running -> Wait

6) Wait -> Ready

So Wait will have to get to Ready and after that it will Run.

Hence 'Wait to Run' is invalid.

Answer 2

Wait/ block to Run is invalid.

Option: (c)

Explanation:

There are several states of process in an operating system. They are as follows,

 - New (Create)

 - Ready

 - Run

 - Blocked or wait

 - Terminated or completed

 - Suspend ready

 - Suspend blocked or suspend waited

In the given question, the options for the transitions are valid, except for option C. The valid transition will be Running to blocked/wait and not wait/block to Run.

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