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Operating_Systems_Orientation - Objectives OperatingSystems...

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Copyright ©: University of Illinois CS 241 Staff 1 Operating Systems  Orientation Objectives  Explain the main purpose of operating systems and describe  milestones of OS evolution Explain fundamental machine concepts Instruction processing Memory hierarchy Interrupts I/O Explain fundamental OS concepts System calls Processes  Synchronization  Files Explain the POSIX standard (UNIX specification) Copyright ©: University of Illinois CS 241 Staff 2 OS Structure Copyright ©: University of Illinois CS 241 Staff 3 Firefox Second Life Yahoo Chat GMail Application Software Network Hardware Read/Write Standard Output Device Control File System Communication Operating System Standard Operating System Interface (Virtual Machine) POSIX  The UNIX Interface Standard Copyright ©: University of Illinois CS 241 Staff 4 Firefox Second Life Yahoo Chat GMail Application Software Read/Write Standard Output Device Control File System Communication Unix POSIX Standard Interface What is an Operating System? It is an  extended machine Hides the messy details that must be performed Presents user with a virtual machine interface,  easier to use It is a  resource manager Each program gets time with the resource Each program gets space on the resource  Copyright ©: University of Illinois CS 241 Staff 5 Machine-dependent layer A Peek into Unix Copyright ©: University of Illinois CS 241 Staff 6 Application Portable OS Layer Libraries User space/level Kernel space/level User/kernel modes are  supported by hardware  Some systems do not have  clear user-kernel boundary
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Machine-dependent layer Application Copyright ©: University of Illinois CS 241 Staff 7 Applications  (Firefox, Emacs, grep) Portable OS Layer Libraries Written by programmer Compiled by  programmer Uses function calls Machine-dependent layer Unix: Libraries Copyright ©: University of Illinois CS 241 Staff 8
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