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Operating System lecture threads
Chapter 4: Threads

Operating System Concepts – 8th Edition

Silberschatz, Galvin and Gagne ©2009

Chapter 4: Threads


Overview



Multithreading Models



Thread Libraries



Threading Issues



Operating System Examples



Windows XP Threads



Linux Threads

Operating System Concepts – 8th Edition

4.2

Silberschatz, Galvin and Gagne ©2009

Objectives


To introduce the notion of a thread — a fundamental unit of CPU utilization that forms the basis of multithreaded computer systems



To discuss the APIs for the Pthreads, Win32, and Java thread libraries



To examine issues related to multithreaded programming

Operating System Concepts – 8th Edition

4.3

Silberschatz, Galvin and Gagne ©2009

Motivation


Threads run within application



Multiple tasks with the application can be implemented by separate threads


Update display



Fetch data



Spell checking



Answer a network request



Process creation is heavy-weight while thread creation is light-weight



Can simplify code, increase efficiency



Kernels are generally multithreaded

Operating System Concepts – 8th Edition

4.4

Silberschatz, Galvin and Gagne ©2009

Single and Multithreaded Processes

Operating System Concepts – 8th Edition

4.5

Silberschatz, Galvin and Gagne ©2009

Benefits


Responsiveness



Resource Sharing



Economy



Scalability

Operating System Concepts – 8th Edition

4.6

Silberschatz, Galvin and Gagne ©2009

Multicore Programming


Multicore systems putting pressure on programmers, challenges include:


Dividing activities



Balance



Data splitting



Data dependency



Testing and debugging

Operating System Concepts – 8th Edition

4.7

Silberschatz, Galvin and Gagne ©2009

Multithreaded Server Architecture

Operating System Concepts – 8th Edition

4.8

Silberschatz,
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