single.dvi 30 Condition Variables Thus far we have developed the notion of a lock and seen how one can be properly built with the right combination of hardware and OS support. Unfortunately, locks are not the only primitives that are needed to build concurrent programs. In particular, there are many cases where a thread wishes […]
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single.dvi 34 Summary Dialogue on Concurrency Professor: So, does your head hurt now? Student: (taking two Motrin tablets) Well, some. It’s hard to think about all the ways threads can interleave. Professor: Indeed it is. I am always amazed that when concurrent execution is involved, just a few lines of code can become nearly impossible
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single.dvi 6 Mechanism: Limited Direct Execution In order to virtualize the CPU, the operating system needs to somehow share the physical CPU among many jobs running seemingly at the same time. The basic idea is simple: run one process for a little while, then run another one, and so forth. By time sharing the CPU
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33 Event-based Concurrency (Advanced) Thus far, we’ve written about concurrency as if the only way to build concurrent applications is to use threads. Like many things in life, this is not completely true. Specifically, a different style of concurrent pro- gramming is often used in both GUI-based applications [O96] as well as some types of
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single.dvi C A Dialogue on Monitors Professor: So it’s you again, huh? Student: I bet you are getting quite tired by now, being so, well you know, old? Not that 50 years old is that old, really. Professor: I’m not 50! I’ve just turned 40, actually. But goodness, I guess to you, being 20-something …
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Lecture 1 CS 111: Operating System Principles Overview 1.0.1 Jon Eyolfson March 30, 2021 This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License cba http://creativecommons.org/licenses/by-sa/4.0/ “All problems in computer science can be solved by another level of indirection” – David Wheeler 1 An Operating System Sits between Applications and Hardware Application Operating
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Lecture 13 CS 111: Operating System Principles Threads 1.0.1 Jon Eyolfson May 4, 2021 This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License cba http://creativecommons.org/licenses/by-sa/4.0/ Threads are Like Processes with Shared Memory The same principle as a process, except by default they share memory They have their own registers, program counter, and
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Lecture 6 CS 111: Operating System Principles Basic IPC 1.0.0 Jon Eyolfson April 8, 2021 This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License cba http://creativecommons.org/licenses/by-sa/4.0/ IPC is Transferring Bytes Between Two or More Processes Reading and writing files is a form of IPC For a process you can read the input,
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Course Recap Lecture 22 CS 111: Operating System Principles Course Recap 1.0.0 Jon Eyolfson June 1, 2021 This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License cba http://creativecommons.org/licenses/by-sa/4.0/ There are 4 Major Concepts in This Course You’ll learn how the following applies to operating systems: • Virtualization • Concurrency • Persistence •
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Lecture 14 CS 111: Operating System Principles Locks 1.0.2 Jon Eyolfson May 6, 2021 This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License cba http://creativecommons.org/licenses/by-sa/4.0/ Data Races Can Occur When Sharing Data A data race is when two concurrent actions access the same variable and at least one of them is a
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