Operating Systems - David Vernon

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Processes /* In the following _incorrect_ version of the producer we reverse */ /* the order of down call on the semaphores. */ /* This will cause DEADLOCK if the buffer is full … Why? */ void producer(void) { int item; } while (TRUE) { /* repeat forever */ produce_item(&item); /* generate next item */ down(&mutex); /* enter critical region */ down(&empty); /* decrement empty count */ enter_item(item); /* put item in buffer */ up(&mutex); /* leave critical region */ up(&full); /* increment count of full slots */ Copyright © 2007 David Vernon (www.vernon.eu)
Processes InterProcess Communication IPC – Monitors » A monitor is a collection of procedures, variables, and data-structures that are all grouped together in a special kind of module or package » Processes may call the monitor procedures but the data-structures are private » Only one process can be active in a monitor at any one instant » Monitors are a programming language construct (so the compiler can treat them differently, typically by including mutual exclusion code) 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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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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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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