Operating Systems - David Vernon

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Memory Management Segmentation – It also facilitates sharing functions in a shared library » Commonly-used functions (e.g. the graphical user interface functions of a window system) can be put in a segment and shared by processes » Without having to have the functions included in the address space of every process which uses them » This can be done on a paged system, but it is much more difficult Copyright © 2007 David Vernon (www.vernon.eu)
Memory Management Segmentation – It also facilitates protection » Different segments (and hence different types of data) can have different types of protection associated with them a function segment could be execute-only an array might be read & write only, not execute » attempts to execute the array segment can then be trapped » All this works because the programmer is aware of what is in each segment » This isn’t the case in a paged system Copyright © 2007 David Vernon (www.vernon.eu)
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Operating Systems David Vernon Copy
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Course Content Historical overview
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Course Content Device management -
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Course Content Networking issues -
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Course Textbook “Modern Operating
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Assessment of Performance First exa
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The Need for Operating Systems Why
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The Need for Operating Systems Comp
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The Need for Operating Systems Exam
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Load B DR ← M(AR) A B C 11111111
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Load B Increment PC A B C 11111111
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Load B AR ← DR(address) A B C 111
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Load B AC ← DR A B 11111111 01001
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The Need for Operating Systems Mach
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What is an Operating System There a
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What is an Operating System OS as a
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History of Operating Systems First
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History of Operating Systems Second
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History of Operating Systems Third
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History of Operating Systems Third
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History of Operating Systems Fourth
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Operating System Concepts System ca
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Operating System Concepts Processes
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Operating System Concepts Files - O
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Operating System Concepts Copyright
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Operating System Concepts Files -Pr
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Operating System Concepts Files - O
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Operating System Concepts System Ca
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Operating System Concepts The Shell
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Operating System Structure Monolith
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Operating System Structure Monolith
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Operating System Structure Virtual
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Operating System Structure Virtual
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Operating System Structure Client-S
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Operating System Structure Client-S
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Processes All modern computer syste
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Processes Single program counter Fo
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Processes Because the OS schedules
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Processes Process Hierarchies - pro
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Processes Running 1 Blocked 4 3 2 R
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Processes Device I/O … the differ
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Processes Interrupts and device I/
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Processes InterProcess Communicatio
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Processes Process A Spooler directo
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Processes Process A Process B Print
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Processes /* process 0 */ main () {
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while (turn == process && intereste
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while (turn == process && intereste
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Processes void consumer(void) { int
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Processes #include “prototypes.h
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Processes void consumer(void) { int
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Processes void writer(void) { while
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Processes Process Scheduling - Crit
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Processes Process Scheduling - Roun
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Processes Process Scheduling - Prio
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Processes Process Scheduling - ‘S
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Processes Process Scheduling - Two
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Memory Management The part of the o
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Memory Management Memory management
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Operating Systems - David Vernon

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