Operating Systems - David Vernon

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Processes InterProcess Communication IPC – Sleep and Wakeup » race condition occurs when: buffer is empty consumer reads count (contents is 0) scheduler suspends consumer scheduler runs producer producer enter item in buffer producer increments count (contents is now 1) producer sends WAKEUP consumer But consumer is NOT asleep, so WAKEUP is lost scheduler suspends producer scheduler resumes consumer Copyright © 2007 David Vernon (www.vernon.eu)
Processes InterProcess Communication IPC – Sleep and Wakeup » race condition occurs when: consumers tests value (previously read) count value is 0 so consumer sleeps() scheduler resumes producer eventually, producer will fill the buffer and sleep() now both producer and consumer sleep … deadlock! » Key problem: waking up a process that is not asleep … wasting a wakeup call » The solution is to use Semaphores 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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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
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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/
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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
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Page 131: Processes void consumer(void) { int
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 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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Operating Systems - David Vernon

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