[ECOS] why is it wrong to call cyg_semaphore_post() in ISR???
Fri Jun 9 09:27:00 GMT 2006
On Fri, Jun 09, 2006 at 11:18:14AM +0200, Monica Dsz wrote:
> >It's a trade off - do you prevent interrupts (hence ISR routines) from
> >running during all data critical sections or do you simply not allow
> >those [ISR] functions to execute code that might perturb critical data?
> >eCos chooses the latter method which allows for lower interrupt latency
> >by putting off things until the DSR can be safely run.
> just to confirm my understanding, does this mean that we never have to
> disable and re-enable the interrupts during critical sections? or are there
> any cases still we have to disable the interrupts in eCos.
Normally, you try not to disable interrupts in RTOS's. You should
protect your critical regions with mutex's, semaphores etc.
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