--- mandeep sandhu <msandhu_d@hotmail.com> wrote: > can another ISR preempt the current executing ISR! > during execution of ISR's are'nt the interrupts > disabled? > > do ISR's also have priority associated with them??? > > i think b4 executing an ISR the kernel calls > "preempt-disable" > (not very sure though....)??? > > - /dev/mandeep > > > mandeep sandhu wrote: > >hi all, > >i've heard that the linux kernel is preemptive from > 2.5 onwards.... > >so can an ISR be preempted by the kernel. as i > understand an ISR doest not > >have a process context, so then what can preempt > it???? > > Yes you're right. An ISR has no process context. But > an ISR can be > interrupted by some code lika for example another > ISR. Interrupts can be > nested in Linux (even in 2.4). > And in 2.5 and 2.6, ISR can be preempted by a thread > or anything else > which has a higher priority. > > > -- > Kernelnewbies: Help each other learn about the Linux > kernel. > Archive: > http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > > _________________________________________________________________ > Get ready to dream with Citibank Ready Cash. > http://go.msnserver.com/IN/49355.asp The Next > Generation Personal Loan! > > > -- > Kernelnewbies: Help each other learn about the Linux > kernel. > Archive: > http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > __________________________________ Do you Yahoo!? Friends. Fun. Try the all-new Yahoo! Messenger. http://messenger.yahoo.com/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
