Description
Introduction to Operating Systems and Processes
1. List three hardware features that enable the implementation of operating system functionality and explain the
significance of each. For instance, a fixed rate clock allows the creation of a variable timer for timesharing.
2. For the computer that you are using, how should OS designers prioritize among reliability, security, portability
and performance? Explain why.
3. To a programmer, a system call looks like any other call to a library procedure. Is it important that a
programmer know which library procedures result in system calls? Under what circumstances and why?
4. How do user programs and system services interact in a microkernel architecture? What are the advantages/disadvantages of the microkernel approach to system design?
5. When a process creates a new process using the fork() operation, which of the following states is shared
between the parent and child processes?
(a) Stack
(b) Heap
(c) Shared memory segments
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6. Consider the following set of processes, their arrival times and expected running times. For each of the
following scheduling algorithms, determine the mean process turnaround time and mean waiting time. Ignore
process switching overhead.
(a) Round Robin (q = 10)
(b) First-Come, First-Served (run in alphabetical order)
(c) Shortest Job First
Process ERT Arrival
A 85 0
B 30 10
C 35 15
D 20 80
E 50 85
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