Does variable value change being transferred to code running in interrupt loop?

[Art]

If you’re going that way it would make more sense to do the PWM in your main code and handle button pushes in the interrupt.
So you’d interrupt on port change and change some variables in the ISR and don’t have to run a loop polling buttons.

Either way unless the PWM is timer driven, it’s still not “emulating something like that”. Even though you might get the job done.

[CuriousOne]

Simply saying, windows is multi tasking OS, and can do multi-tasking even on single core CPU. How to do it similar way on PIC ?

[Art]

With a hardware timer. ie. Time slice, time splitting.
The same way other platforms and threading languages (C) do it.