Computer Science Assignment - problem solving

Problems:

3.1) The following state transition table is a simplified model of process management, with the labels representing transitions between states of READY, RUN, BLOCKED, AND NONRESIDENT.

Give an example of an event that can cause each of the above transitions. Draw a diagram if that helps.

3.10) In a number of early computers, an interrupt caused the register values to be stored in fixed location associated with the given interrupt signal. Under what circumstances is this a practical technique? Explain why it is inconvenient in general.

3.12) You have executed the following C program:

                                                main ()

                                                int pid;

                                                Pid = fork ();

                                                Printf (“%d n , pid);

What are the possible outputs, assuming the fork succeeded?

4.1) It was pointed out that two advantages of using multiple threads within a process are that (1) less work is involved in creating a new thread within an existing process than in creating a new process, and (2) communication among threads within the same process is simplified. Is it also the case that a mode switch between threads within the same process involves less work than a mode switch between two threads in different processes?

4.2) In the discussion of ULTs verses KLTs, it was pointed out that a disadvantage of ULTs is that when a ULT executes a system call, not only is that thread blocked, but also all of the threads within the process are blocked. Why is that so?

4.5) If a process exits and there are still threads of that process running, will they continue to run? Explain!