Hello, Antonio Mancina <a.mancina@xxxxxxxx> [2006-04-12]: > Mulyadi Santosa wrote: > >Sorry for the late reply. I have tried to test your user space test > >program and the kernel module inside my Qemu virtual machine. And the > >result is...there is no delay inside the user space test program. The > >loop is still counting while the kernel module is correctly busy > >waiting for 10 seconds (10*HZ). > > Yes, I did the test as well, using your code. Same result, it just works. Ok, now I found the reason. All kernels I tested have the adeos-ipipe (for RTAI or Xenomai) patch applied. Without that patch, it just works ... Thanks. Regards, Bernhard -- I couldn't give [Bill Gates] advice in business and he couldn't give me advice in technology. -- Linus Benedict Torvalds -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/