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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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When do process switching takes place

I am confused about the process switching between two processes. When a new process is created using fork, what are the general rules applicable for switching between processes. Is it only when one processes goes to idle state? I have few…
user567879
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Running a function right after each context switch, in C under windows-XP

I'm programming a multithreading application in C under windows-XP. I'm looking for a way to run a function, right after each context-switch between threads of the application (and just before the starting of the new thread). To be more precise, I…
Nir S.
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ZF2 equivalent of Zend_Controller_Action_Helper_ContextSwitch?

I cannot find something similar in Zend Framework 2.
ilhan
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Overriden timer interrupt not working properly

I am working on a small kernel as a project for my University. I have overridden (not sure if that's the correct expression) a timer interrupt routine. It works well until the first context switching. Context switching is in dispatch() which is…
Invader Zim
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Why synchronization requires a context switch down to the OS?

I was watching a presentation on high performance computing and starting at 24:55 one of the presenter states that synchronization by acquiring a lock requires a context switch down to the kernel of the OS (not even the one of the virtual machine,…
wishihadabettername
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how to force context switching in embedded development kit

i learn these days about embedded development with multi processors, and i wanted to ask if it is possible to force a context switching in debug mode, to access a specific thread i want?. and if it is possible, is there a way to do this through the…
user1765376
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how quick can the processor handle the interrupts

I was studying about interrupts. So most architecture are interrupt driven, if everything is interrupt driven, how fast the processor can handle all of those. For example, while pressing a key board keys, it creates an interrupt asking the kernel to…
howtechstuffworks
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Why is the context not saved in the process itself instead of the PCB?

I have read that when a context switch happens, the context of that particular process will be saved in the process control block. But I wonder why the context couldn't be saved in the process itself so the CPU only had to remind itself which…
NimaJan
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Context switch interrupt handler

Which interrupt handler is responsible for context switching in multitasking system? Sorry for my English.
Nik Novák
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relation between warp scheduling and warp context switching in Cuda

As far as I understand, a ready warp is a warp that can be executed in warp scheduling. A waiting warp is waiting for source operands to be fetched or computed so that it can't be executed. Warp scheduler chooses a ready warp to execute for "warp…
LongY
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DIFFERENT TASKS ASSIGNED TO DIFFERENT INSTANCES OF FORK() OF A PROCESS IN C

Can I assign different task to different instances of fork() of a process in C ? like for example: program.c has been forked 3 times int main() { pid_t pid; pid = fork(); pid = fork(); pid = fork(); } now to every instance of fork()…
Shayan Ahmad
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Thread context switch in one process & two processes

Is it faster to context-switch between two threads within the same process THAN to context switch between two threads within 2 different processes?
Rouki
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Too many or too few context switches undesirable for computer system?

I would like to know why too many or too few context switches would be undesirable in a computer system, would be really grateful if someone knew and could explain it to me. thanks
user2765415
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