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Chapter 3
Overview of Operating Systems
Copyright © 2008
Introduction
• Computing Environments and Nature of Computations • Classes of Operating Systems
• Efficiency, System Performance, and User Service • Batch Processing Systems
Operating Systems, by Dhananjay Dhamdherehamdhere 3.2 2
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Introduction (continued)
• Multiprogramming Systems • Time-Sharing Systems
• Real-Time Operating Systems • Distributed Operating Systems • Modern Operating Systems
Operating Systems, by Dhananjay Dhamdherehamdhere 3.3 3
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Computing Environments and Nature of Computations
• A computing environment consists of a computer system, its interfaces with other systems, and the services provided by its operating system to its users and their programs
• Evolution:
– Noninteractive Computing Environments – Interactive Computing Environments
– Real-Time, Distributed, and Embedded Environments – Modern Computing Environments
Operating Systems, by Dhananjay Dhamdherehamdhere 3.4 4
Copyright © 2008
Computing Environments and Nature of Computations (continued)
• Noninteractive Computing Environments – OS focuses on efficient use of resources – Computations in form of program or job
• Interactive Computing Environments
– OS focuses on reducing average amount of time required to implement an interaction between a user and his computation
– Execution of a program is called a process
Operating Systems, by Dhananjay Dhamdherehamdhere 3.5 5
Copyright © 2008
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