[ECOS] Atomic operations

[Jonathan Larmour]

"Boris V. Guzhov" wrote:
> >
> >If you do need to go faster, you can try disabling and enabling
> >interrupts using cyg_interrupt_disable() and cyg_interrupt_enable().
> >Since there are only a few instructions involved for code like this,
> >it is unlikely that the maximum interrupt latency will be affected.
> >
> >Alternatively there might be some x86 instructions which will do the
> >right thing without having to disable interrupts, and which you could
> >invoke using some inline assembler. It has been quite a while since I
> >did any x86 assembler programming, I cannot help there.
>
> Thanks.
> I think that the instructions of the CPU interrupts disabling/enabling are
> available in many CPUs.
> And it's useful to have  HAL macros's for them.

I think the HAL_ENABLE/DISABLE/RESTORE_INTERRUPTS macros in
hal/i386/pc/VERSION/include/var_intr.h are what you are probably looking
for here.

Jifl
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