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Questions tagged [context-switch]

A context switch is the process of storing and restoring the state (context) of a process.

In computing, a context switch is the process of storing and restoring the state (context) of a process so that execution can be resumed from the same point at a later time. This enables multiple processes to share a single CPU and is an essential feature of a multitasking operating system. What constitutes the context is determined by the processor and the operating system.

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how to understand the function of "__swtich_ to" for contex-switch in the ARM linux

I am trying to understand how the context switch of linux works which is based on the ARM. So i want to understand following codes. ENTRY(__switch_to) add ip, r1, #TI_CPU_SAVE ldr r3, [r2, #TI_TP_VALUE] stmia ip!, {r4 - sl, fp, sp, lr} @ Store…
attila
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Cursor jumping in cmd when switching context

I have a problem with manual context switching. I am implementing kernel with multi-threading in C with assembly code by manually saving stack segment and stack pointer and restoring them. Simple tasks work but trying to execute a function that is…
tokyo
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x86 Page Directory multi process

I want to know if the Page Directory of all running processes is kept in the main memory, or at any moment we only keep one page directory in the memory, and upon context switch the old one will be flushed out of memory, and the new one is brought…
Hoda
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Thread scheduling overhead and context switching

i just want to clear my concept on multithreading overheads.In a java book "Java Concurrency In Practice"by Brian Göetz i read following paragraph in Chapter-11 section-11.1. "While the goal maybe to improve performance overall, using multiple…
Faisal Bahadur
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How to monitor context switch in windows 7?

How can I monitor process/thread context switch using either kernel driver or API hooking in windows 7 ? I want to log the register values when a process (for e.g., internet explorer) goes into the resume/suspend state at the time of context switch.…
user2606719
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Intterupts - context-switcht to stack or PCB

I found this link describing interrupts and how a CPU manages them. http://www.ni.com/white-paper/2874/en/ I remember from my studies in computer-science that when an interrupt occurrs the cpu saves whats in its registers and stores that in a PCB…
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Measuring time of a context switch using clock_gettime()

I am trying to measure the average time of a context switch using threads and pipes, however when I use clock_gettime() I get an "undefined reference to clock_gettime()" even though I believe I have the appropriate header files. What the program is…
KoolaidLips
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operating system - context switches

I have been confused about the issue of context switches between processes, given round robin scheduler of certain time slice (which is what unix/windows both use in a basic sense). So, suppose we have 200 processes running on a single core machine.…
Bober02
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How does thread context-switching work with global variable?

I have been confused at this question: I have C++ function: void withdraw(int x) { balance = balance - x; } balance is a global integer variable, which equals to 100 at the start. We run the above function with two different thread: thread A…
acx_cosmos
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OS - User stack - not really 4096 of usable memory

Could someone confirm that when we say that an application has 4096 bytes for its stack, it can actually not use all this space because there are memory used to switch between applications (trapframes, ...) usually located on top of the stack. This…
Jdarc
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Netty - Application sequential logic and how to avoid a context switch?

I am writing a messaging system using Netty. I cannot send a subsequent message before the first message has been sent successfully (and at times wait for a response of the send from the peer endpoint). I see recommendations not to wait for future…
Sunny
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Powershell Count context switches

I'm trying to display the number of context switches during one second in PowerShell. I've so far been trying the Get-Counter -Counter "System\Context Switches/sec" with both " " and ' ' and both leads to the error: Get-Counter : Internal…
Thomas
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stack and interrupt context

This is a question about the stacks and interrupts. Lets consider a program written in the C language where there is one thread and one interrupt. 1) The interrupt (sampleReady()) indicates to the program that a sample is waiting on a…
Smurf
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Titanium: Different execution contexts are not multi-threaded?

I am trying to use titanium execution contexts to produce parallel code execution between the main application context and others. I am using CreateWindow with a url property refers to a .js file inside "lib" folder. But by logging the execution on…
Ahmed Said
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Relationship between context swich overhead and synchronization overhead?

I want to understand a simple scenario where there are so many threads competing for a synchronized shared resource. only one thread definitely will acquire a lock on the resource and all other must wait, now on resource availability each waiting…
ahmad raza
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