Operating Systems - David Vernon

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Processes /*** solution to readers & writers with semaphores ***/ #include “prototypes.h” typedef int semaphore semaphore mutex = 1; /* controls access to rc */ semaphore db = 1; /* controls access to the database */ int rc = 0; /* # of processes reading or wanting to */ void reader(void) { while (TRUE) { /* repeat forever */ down(&mutex); /* get exclusive access to rc */ rc = rc + 1; /* one reader more now */ if (rc == 1) down(&db); /* if this is the first reader */ up(&mutex); /* release exclusive access to rc */ read_database(); /* access the database */ down(&mutex); /* get exclusive access to rc */ rc = rc - 1; /* one reader fewer now */ if (rc == 0) up(&db) /* if this is the last reader … */ up(&mutex); /* release exclusive access to rc */ use_data_read(); Copyright © 2007 /* David non-critical Vernon (www.vernon.eu) section */
Processes void writer(void) { while (TRUE) { /* repeat forever */ think_up_data(); /* non-critical section */ down(&db); /* get exclusive access to database */ write_database(); /* update the data */ up(&db); /* release exclusive access */ } 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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Page 175 and 176: Memory Management Memory management
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Memory Management Virtual Memory -
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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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