Re: [ECOS] Saving application state

["Ruchika Singh" <rusingh at ecs dot umass dot edu>]

sandeep <sandeep@codito.com> said:

> what exactly you are looking for? what hardware/setup? issues would be
different 
> from single to multiprocessor system. I consider you are on a single processor 
> system.
> 
> you are possibly looking for something akin to hibernation support of 
> Windows/Linux. you probably want to shut down the system? or looking for taking 
> off this multi-threaded application completely w/o shutting the sytem down and 
> loading another app? or are you looking for something like wake-on-lan (i don't 
> know more than a layman about this).
> 
> a guess, is it something to do with your MS project work? ;)



I am targeting a uniprocessor system. The ecos is operating on intel 80200
xscale processor ADI board. I intend to load the application and OS image and
 keep saving application state at regular intervals. Initially I do not indend
to shut down the system, the kernel and application continue execution however
 at a some arbitarary time I want the application to go back to the saved state.  

So i am interested in knowing the address space of entire application. Where
are dynamic objects saved.


> 
> > I am interested in saving the state of an application(mutithreaded) , so that 
> > it can be started at a later time from a point where its state was last saved.
> > I understand I'll have save state of all threads in application. Which will 
> > basically be each threads stack. Can I use HAL_Savedregisters which is used 
> > in context switching for this, or is using setjmp()/ long jmp better.
> HAL_SavedRegisters would save only the registers participating in context 
> switching. that may not be (and almost all the h/w ecos is on, it won't be) 
> saving all the registers.
> 
> setjmp/longjmp won't solving your problems.
> 
> > Also I am confused where exactly are global variables of application stored 
> > and how do store heap .
> 
> If you are looking at only not-running this application of yours but system is 
> up and running all the while, you have lots of memory to load other apps, then 
> the problem is far more simpler.
> 
> Unless your requirements/problem specification is bit clear, people might
not be 
> able to help you.
> 
> good luck.
> --------------------------------------------------------------------------
> A real patriot is the fellow who gets a parking ticket and rejoices
> that the system works.
> --------------------------------------------------------------------------
> 



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