What is an Operating System?

• mémoire - matière potentielle : pkmemorypkmemory pjmemorypjmemory
• mémoire - matière potentielle : management
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• mémoire - matière potentielle : protection
• mémoire - matière potentielle : space
• mémoire - matière potentielle : resource
• mémoire - matière potentielle : address
• mémoire - matière potentielle : access
• mémoire - matière potentielle : space with a new program
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• mémoire - matière potentielle : location
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Operating Systems 9/3/2009 CSC 256/456 - Spring 2007 1 9/3/2009 CSC 2/456 1 Computer System Organization CS 256/456 Dept. of Computer Science University of Rochester 9/3/2009 CSC 2/456 2 What is an Operating System? • Software that abstracts the computer hardware – Hides the messy details of the underlying hardware – Presents users with a resource abstraction that is easy to use – Extends or virtualizes the underlying machine • Manages the resources – Processors, memory, timers, disks, mice, network interfaces, printers, displays, … – Allows multiple users and programs to

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• user programs
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• system
• program