Operating Systems - David Vernon

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Processes /* process 0 */ main () { while (TRUE) { do_some_work(); enter_region(0); critical_section(); leave_region(0); do_more_work(); } } /* process 1 */ main () { while (TRUE) { do_something(); enter_region(1); critical_section(); leave_region(1); do_something_else(); } } turn interested 1 0 0 Copyright © 2007 David Vernon (www.vernon.eu)
Processes InterProcess Communication IPC – Mutual Exclusion with Busy Waiting » Technique 5: TSL » hardware-based solution » uses a special instruction: Test and Set Lock TSL reads contents of memory word into a register stores a non-zero value at that memory location » since interrupts only occur at the end of an instruction cycle, TSL is ‘atomic’ and can’t be interrupted » TLS locks the memory bus: other CPUs can’t access that location until the operation is complete 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
Page 71 and 72: Operating System Structure Monolith
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Page 75 and 76: Operating System Structure Virtual
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Page 87 and 88: Processes Because the OS schedules
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Page 93 and 94: Processes Device I/O … the differ
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Page 101 and 102: Processes Process A Process B Print
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Page 141 and 142: Processes #include “prototypes.h
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Page 163 and 164: Processes Process Scheduling - Crit
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Memory Management The part of the o
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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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