"Stephen D. Cohen" wrote:
>
> Stuart Et. Al.,
>
> > I may be mistaken, but I think in RTAI/RTL, you can set a
> > semaphore from
> > within the ISR, exit and on exit the real-time task/thread
> > will run its
> > code. If it doesn't work this way, it would be nice to have this
> > facility available as this is typical of the sort of thing I
> > used to do
> > with pSOS.
>
> That is exactly the same structure I used in VxWorks. I was under
> the impression, from messages on the list, that this did not work in RTL.
>
> As far as semaphores go, I demand a stable base for RTL, so I am
> still using RTL 2.2 on Linux 2.2-14. This version does not contain
> semaphores as near as I can tell. I am also not certain that semaphores
> work as expected in V3. Anybody want to fill us in (after answering my
> original question)?
>
Have you looked at RTAI, this has semaphores, mailboxes etc ??
> It seems to me that the semaphore handling routines should simply
> check to see if anyone is waiting for a semaphore (when it is given) and, if
> so, call the scheduler. The scheduler should also be called on return from
> every interrupt. Is this the case?
>
I think you're correct (RTL & RTAI). IMHO it should be changed so there
is a way to pend a task to run only when an ISR has exited.
Regards, Stuart
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