Operating Systems - David Vernon

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Processes void consumer(void) { int item; } while (TRUE) { /* repeat forever */ down(&full); /* decrement full count */ down(&mutex); /* enter critical region */ remove_item(&item); /* take item out of buffer */ up(&mutex); /* leave critical region */ up(&empty); /* increment count on empty slots */ consume_item(&item); Copyright © 2007 David Vernon (www.vernon.eu)
Processes InterProcess Communication IPC – Semaphores » In the solution to the producer-consumer problem we used semaphores for two distinct purposes » mutual exclusion (mutex) » synchronization (empty and full) guarantee certain event sequences do (or do not) occur – producer stops when buffer is full – consumer stops when buffer is empty 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 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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Memory Management Disk Page 1 Proce
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Memory Management Virtual Memory -
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Memory Management Virtual Address S
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Memory Management Second-level page
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