about platform_execute in usb_drv

[jaeyong yoo]

Please forgive my ignorance.

> This function is used to switch the stack and execute a given function.

Why do we have to switch the stack?
For instance, what would happen if we do not switch the stack?

Regards,
Jaeyong

On Tue, Jan 8, 2013 at 7:31 PM, Sebastian Sumpf <
Sebastian.Sumpf at ...1...> wrote:

> Hello Jaeyong,
>
> On 01/08/2013 03:26 AM, jaeyong yoo wrote:
> > Hello,
> >
> > Could you explain about the intend behind platform_execute in usb_drv?
> > I see it is similar to executing a function but it uses stack allocated
> > by dde_kit_simple_malloc, and I don't understand why.
>
> This function is used to switch the stack and execute a given function.
> Since stack switching has to be performed in assembly, the function must
> be implemented for each platform (e.g. ARM, x86). In the great picture
> this is part of a very simple user-threading implementation. Each
> "pseudo" thread needs a stack to need lose its call trace, such a thread
> is scheduled using setjmp/longjmp calls (see:
> dde_linux/src/drivers/usb/routine.h).
>
>
> Regards,
>
> Sebastian
>
>
>
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> Sebastian Sumpf
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