张晶 wrote: > 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.
The Xenomai nucleus does dispatch - to the registered handler(s). > > 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 >> >> >> Jan
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