1-sol - CHAPTER 1 Introduction Practice Exercises 1.1 What...

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1 CHAPTER Introduction Practice Exercises 1.1 What are the three main purposes of an operating system? Answer: • To provide an environment for a computer user to execute programs on computer hardware in a convenient and efFcient manner. • To allocate the separate resources of the computer as needed to solve the problem given. The allocation process should be as fair and efFcient as possible. • As a control program it serves two major functions: (1) supervision of the execution of user programs to prevent errors and improper use of the computer, and (2) management of the operation and control of I/O devices. 1.2 What are the main differences between operating systems for mainframe computers and personal computers? Answer: Generally, operating systems for batch systems have simpler requirements than for personal computers. Batch systems do not have to be concerned with interacting with a user as much as a personal computer. As a result, an operating system for a PC must be concerned with response time for an interactive user. Batch systems do not have such requirements. A pure batch system also may have not to handle time sharing, whereas an operating system must switch rapidly between different jobs. 1.3 List the four steps that are necessary to run a program on a completely dedicated machine. Answer: 1
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2 Chapter 1 Introduction a. Reserve machine time. b. Manually load program into memory. c. Load starting address and begin execution. d. Monitor and control execution of program from console. 1.4 We have stressed the need for an operating system to make efFcient use of the computing hardware. When is it appropriate for the operating system to forsake this principle and to waste resources? Why is such a system not really wasteful? Answer:
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This note was uploaded on 04/05/2008 for the course CSCE 4000 taught by Professor Anonymous during the Spring '08 term at Arkansas.

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1-sol - CHAPTER 1 Introduction Practice Exercises 1.1 What...

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