>>>>> "pankaj" == pankaj chauhan <chauhan_ait@yahoo.co.in> writes: pankaj> hi all , pankaj> i have a small doubt : Is it possible to have pankaj> synchronization between processes running on different pankaj> processors in a SMP without any harware support for pankaj> that. I mean can we implement mutual exclusion in pankaj> access of shared data without any 'lock ' prefix , or pankaj> atomic_swap , or atomic test_and_set instructions in pankaj> the instruction set of the machine. If yes then How ?? Search for Dekker's algorithm. ~velco -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/