[SOLVED] INTERRUPTS vs MULTI TASKING

Hi all

A real time embedded board can be in two forms
BARE METAL w/o os and os based like linux based .

My question is why os based board that offers multi tasking : tasks and threads,
why not rely on bare metal based on priority based interrupts ?

Thanks
Eiico

I can hardly understand your question. I think a multitasking/multithreading os cannot work as a real time embedded system, because you can never guarantee if the given thread was running at the time it would need to. And also you cannot guarantee if the os could switch to that process in time. A bare metal system based on interrupts will never handle irqs as threads and do a time based multitasking.

os I MEANT linux .

Isn't LINUX just for that, threads and processes ?
A bare metal board is for IRQs only not for threads, I realise that .

"I think a multitasking/multithreading os cannot work as a real time embedded system"
again I meant LINUX based board .

Thanks
Elico

When you say a 'bare metal board without OS', I am assuming you mean using analog and/or digital logic circuits only. If that's the case, then the question becomes how complex is the required function? At low levels of complexity and with fixed function, a non-OS configuration will be preferable. As complexity of function increases, and the requirement for a multitude of functions is added, a software-based board quickly becomes more cost-effective.

@pan64 A realtime OS, by definition, guarantees service times. Linux has a real-time patch available that provides hard realtime service.

thanks
Elico