Operating Systems - David Vernon

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Processes InterProcess Communication IPC – Mutual Exclusion with Busy Waiting » Technique 5: TSL enter_region: tsl register, flag ! Copy flag to register and set flag to 1 cmp register, #0 ! Was flag zero? jnz enter_region ! If it was non-zero, lock was set, so loop ret ! Now zero, so return to caller and allow entry ! to critical region leave_region: mov flag, #0 ! Store a 0 in flag ret ! Return to caller Copyright © 2007 David Vernon (www.vernon.eu)
Processes InterProcess Communication IPC – Mutual Exclusion with Busy Waiting » Both Peterson’s Solution and the TSL solution are correct » But both require busy waiting: if a process wants to enter its critical region, it checks a flag to see if entry is allowed if it is, proceed otherwise, loop continuously until it is » Not only is busy waiting wasteful of CPU time, it also causes other problems: priority inversion 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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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 » O
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Memory Management Segmentation - It
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