hi, yes, i can't do IO,but never wait, but instead i loop until upto i wont get packet, this is as good as busy waiting is this a wrong way i'm thinking?,or second is to wait and put the thread to sleep, even a 1 jiffies sleep is working, this means delay is when i get packet and when i process it is 1ms,and worst 10ms in 2.4,but what for some reason it has to immidiatly process the data as soon as packet arrives. i find several ways in google,from checking O_NONBLOCK flag etc. but i wont understood those as thise are just a code snippets and no explaination is given thanks --- Jan Hudec <bulb@ucw.cz> wrote: > On Tue, May 18, 2004 at 11:38:28 -0700, prasanna > wakhare wrote: > > hi, > > I'm using two kernel thread one continuously > executes > > sock_recvmsg and other sends it > sontinuosly,ofcource > > if i wont put the thread to the sleep the computer > > will hang when loading the module containing > kernel > > thread,i given MSG_DONTWAIT option in > sock_recvmsg, > > why i had to put the thread to sleep? > > Do I understand you right, that you called the > sock_recvmsg with > MSG_DONTWAIT and it did lock up? Ok, now, that's > expected behaviour. > Consider what MSG_DONTWAIT means. > > > i'm using 2.4.20-8 kernel is that because the > kernel > > is not preemptive? > > so if i will execute those in 2.6 > > will it work? > > No. 2.6 is only *optionaly* preemptive. > > Your design is broken anyway. You can't do IO and > never wait! > > > 2.while unloading the same module the kernel > gives > > oopse saying "unable to handle virtual address at > > c0xxxxx address" it will hang somewhere in > > kernel_thread_helper in process.c > > i google search above but i did not get any > threads > > plz let me know the reason... > > Kernel equivalent of "Segmentation fault". > > ------------------------------------------------------------------------------- > Jan 'Bulb' Hudec <bulb@ucw.cz> > > ATTACHMENT part 2 application/pgp-signature name=signature.asc __________________________________ Do you Yahoo!? SBC Yahoo! - Internet access at a great low price. http://promo.yahoo.com/sbc/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
