Hi All, I am confused abt the differences and usage(when and where) of these mechanisms. I think they are one and the same with the concept wise(I dont' know I am correct or not). Can anybody help me out in understing these primitives? thanks, -HG -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/