Why _ThreadProcessSignalsFromIrq() in new exception processing?

[Joel Sherrill]

Valette Eric wrote:
> 
> Valette Eric wrote:
> 
> > BTW : the clearing of_ISR_Signals_to_thread_executing should be done
> > inside the _Thread_Dispatch to avoid errors like this one...
> 
> Forget this : it is rather a bad idea as Thread_Dispatch is called from
> non ISR context...

Right.  Many ports actually have a label "_ISR_Thread_Dispatch" which is
the point to which _ISR_Handler returns when a onctext switch or signal
evaluation is needed.  The typical implementaiton of that pushes some 
registers, calls _Thread_Dispatch, pops them and returns.  This way
there is a simple, single patch out of the ISR for all cases requiring
OS evaluation.


> -- eric who should think before posting

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel at OARcorp.com                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
Support Available                (256) 722-9985