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ch1 - CHAPTER 1 OPERATING SYSTEM FUNDAMENTALS What is an...

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CHAPTER 1: OPERATING SYSTEM FUNDAMENTALS What is an operating system? A collection of software modules to assist programmers in enhancing system efficiency, flexibility , and robustness An Extended Machine from the users’ viewpoint A Resource Manager from the system’s viewpoint What are the primary functions of an operating system? multiplexing the processor(s) scheduling processes coordinating interaction among processes, interprocess communication and synchronization managing system resources (I/O, memory, data files) enforcing access control and protection maintaining system integrity and performing error recovery providing an interface to the users 1
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Evolution of modern operating systems 1. Centralized operating system: resource management and extended ma- chine to support Virtuality (a) Resident Monitor (RM) - user=operator, single process (b) Batch Systems - user negationslash = operator, single multiple processes (c) Timesharing Systems - interactive, multiple processes (d) Personal Computers - user=operator, single multiple processes 2. Network operating system: resource sharing to achieve Interoperability 3. Distributed operating system: a single computer view of a multiple- computer system for Transparency 4. Cooperative autonomous system: cooperative work with Autonomicity A spectrum of modern operating systems Decreasing Degree of Transparency Decreasing Degree of Hardware and Software Coupling 2nd 4th 3rd 1st system operating network system autonomous cooperative system operating distributed system operating centralized 2
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Operating system structuring methods modularization vertical partitioning (layered one-in-one-out structure) horizontal partitioning client/server model minimal (or micro) kernel subsystem with API and SPI Example of OS Partitioning: programming environment library command interpreter compiler
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  • Fall '08
  • Staff
  • modern operating systems, Interprocess Communication, virtual memory support, Direct Blk, device management service

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