Operating Systems - David Vernon

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Processes InterProcess Communication IPC – Semaphores (Dijkstra 1965) » a special type of variable » used to count the number of wakeups (for future use) » can have a value 0 … no wakeups saved » can have a positive integer value … the number of wakeups pending » two operations: DOWN and UP (P and V in the original paper) Copyright © 2007 David Vernon (www.vernon.eu)
Processes InterProcess Communication IPC – Semaphores (Dijkstra 1965) »DOWN generalization of SLEEP checks if semaphore value is greater than zero if semaphore > 0 then decrement semaphore else process is blocked (sleep) decrement semaphore 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
Page 83 and 84: Processes All modern computer syste
Page 85 and 86: Processes Single program counter Fo
Page 87 and 88: Processes Because the OS schedules
Page 89 and 90: Processes Process Hierarchies - pro
Page 91 and 92: Processes Running 1 Blocked 4 3 2 R
Page 93 and 94: Processes Device I/O … the differ
Page 95 and 96: Processes Interrupts and device I/
Page 97 and 98: Processes InterProcess Communicatio
Page 99 and 100: Processes Process A Spooler directo
Page 101 and 102: Processes Process A Process B Print
Page 113 and 114: Processes /* process 0 */ main () {
Page 117 and 118: while (turn == process && intereste
Page 119 and 120: while (turn == process && intereste
Page 131 and 132: Processes void consumer(void) { int
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Page 141 and 142: Processes #include “prototypes.h
Page 157 and 158: Processes void consumer(void) { int
Page 161 and 162: Processes void writer(void) { while
Page 163 and 164: Processes Process Scheduling - Crit
Page 165 and 166: Processes Process Scheduling - Roun
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Page 169 and 170: Processes Process Scheduling - ‘S
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Page 173 and 174: Memory Management The part of the o
Page 175 and 176: Memory Management Memory management
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Memory Management Swapping - memory
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Memory Management Swapping - memory
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Memory Management Virtual Memory -
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Memory Management Disk Page 1 Proce
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Memory Management Disk Page 1 Proce
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Memory Management Virtual Address S
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Memory Management Second-level page
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Memory Management Segmentation - Th
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Memory Management Segmentation - To
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Memory Management Segmentation » O
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Memory Management Segmentation - It
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