ch01 - Chapter 1 Introducing Operating Systems...

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Chapter 1 Introducing Operating Systems Understanding Operating Systems, Fourth Edition
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Understanding Operating Systems, Fourth Edition 2 Objectives Objectives You will be able to describe: The basic role of an operating system The major operating system software subsystem managers and their functions The types of machine hardware on which operating systems run, and give at least one example of an operating system for each of the following: PDAs, microcomputers, minicomputers, mainframes, workstations, and supercomputers
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Understanding Operating Systems, Fourth Edition 3 Objectives (continued) Objectives (continued) Describe: The differences between the following types of operating systems: batch, interactive, real-time, hybrid, and embedded Multiprocessing and its impact on the evolution of operating system software System architecture trends in current operating systems
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Understanding Operating Systems, Fourth Edition 4 Understanding Operating Systems Understanding Operating Systems “I think there is a world market for maybe five computers.” Thomas J. Watson (1874–1956; chairman of IBM 1949–1956)
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Understanding Operating Systems, Fourth Edition 5 What What is is an Operating System? an Operating System? Operating System: Part of the computing system that manages all of the hardware and software Controls every file, every device, every section of main memory, and every nanosecond of processing time Controls who can use the system and how Computer system consists of: Software (programs) Hardware (the physical machine and its electronic components)
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Understanding Operating Systems, Fourth Edition 6 Operating System Operating System Software Software Essential managers of an operating system: Memory Manager Processor Manager Device Manager File Manager Each manager both works closely with the other managers and performs its unique role User Command Interface is unique to each operating system
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Understanding Operating Systems, Fourth Edition 7 Operating System Operating System Software Software (continued) (continued) Figure 1.1: Model of a non-networked operating system
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Understanding Operating Systems, Fourth Edition 8 Operating System Operating System Software Software (continued) (continued) Each subsystem manager must perform the following tasks: Monitor its resources continuously Enforce the policies that determine who gets what, when, and how much Allocate the resource when it’s appropriate Deallocate the resource when appropriate
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Understanding Operating Systems, Fourth Edition 9 Operating System Operating System Software Software (continued) (continued) Figure 1.2: Subsystems managers at the base of a pyramid
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Understanding Operating Systems, Fourth Edition 10 Operating System Operating System Software Software (continued) (continued) Memory Manager: In charge of main memory (RAM) Responsibilities include: Preserves the space in main memory occupied by
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This note was uploaded on 10/20/2008 for the course IST 341 taught by Professor Woldering during the Fall '08 term at Cleveland State.

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ch01 - Chapter 1 Introducing Operating Systems...

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