Ivan,
Yes, rtl_no_interrupts(flags) makes sure there will be no
preemption. So:
rtl_no_interrupts(flags);
access variables();
rtl_restore_interrupts(flags);
Note that on an SMP system, you will also need to get a
spinlock to prevent concurrent access from another CPU.
Michael.
Ivan Martinez ([EMAIL PROTECTED]) wrote:
> Stuart Hughes wrote:
> >
> > Ivan Martinez wrote:
> > >
> > > Hello!
> > > I have some real time tasks/threads sharing some variables, so I would
> > > like to prevent them from being interrupted by other task when reading
> > > or writing them. How can I do that?. Do I get what I want with
> > > "rtl_no_iterrupts"?.
> > > Thank you!.
> >
> > Hi Ivan,
> >
> > I use the following wrappers:
> >
> > #ifdef CONFIG_RTL
> >
> > #include <asm/rtl_sync.h>
> > #undef cli()
> > #undef sti()
> > #undef save_flags(x)
> > #undef restore_flags(x)
> > #define sti()
> > #define cli()
> > #define save_flags(x) rtl_hard_savef_and_cli(x)
> > #define restore_flags(x) rtl_hard_restore_flags(x)
> >
> > #else
> > .....
> >
> > Then you can just use save_flags(flags) and restore_flags(flags) pairs.
> > It works on a uniprocessor, but there may well be a better way.
> >
> > Regards, Stuart
>
> I can't understand very well what you do with that. Could somebody
> explain me a bit about it?. Any simpler way of doing what I want?. Thank
> you.
>
> --
> Ivan Martinez (Rodriguez)
> Bch in Computer Science - MSc student
> http://www.student.dtu.dk/~u990873
> "Got fabes?"
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