hi, Thank you for your reply!
2007/8/27, Jan Kiszka <[EMAIL PROTECTED]>: > > ?? wrote: > > hi all, > > > > In SMP system, an edge triggerred interrupt may be dispatched to > multiple > > cpus, so the RT ISR of this interrupt may be involved on multiple cpus > at > > the same time. The question comes: is RT ISR need to be reentrant as > > designed or do I miss something? > > Good question. I would say: yes, it's the I-pipe user's job to take care > of re-entrance safety. > > Vanilla Linux prevents this via the IRQ_INPROGRESS flag. Xenomai 2.4 and > since 2.3.2 achieves re-entrance protection for the registered driver > handler by holding the IRQ-related spinlock while calling into that > handler. AFAIK, Xenomai 2.3.3 simply uses the IRQ dispatcher of i-pipe and do not supply its own dispatcher. Still, this isn't something the user should build his system > upon. It is rather recommended for determinism and efficiency reasons to > assign RT IRQs to a specific CPU. Good suggestion！Thanks again! HTH, > Jan > > >
_______________________________________________ Adeos-main mailing list [email protected] https://mail.gna.org/listinfo/adeos-main
