can u plz explain how these techniques work without any lock prefix kind of thing. i know only about the implementation of spinlocks for ix86, in which we have to use a lock prefix before the instructions for testing and storing operation of the spinlock. i am still not understanding how we can prevent any other processor from getting control of the bus before our lock operation is complete , say we have just tested the spinlock and found it to be unlocked , but before we set it to be locked the control of bus goes to another processor which also operates on the same lock , now if we do'nt have any hardware support for preventing the control of bus going to another processor during an operation that has to be atomic, how can we ensure atomicity and avoid races. Rgds, pankaj chauhan --- Avishay Traeger <atraeger@cs.sunysb.edu> wrote: > There are software implementations for locking. > I've made my own > semaphore classes in the end and used them for class > projects, and if I > remember correctly there are a couple other ways of > implementing > synchronization. > > Avishay Traeger > > > On Wed, 31 Dec 2003, [iso-8859-1] pankaj chauhan > wrote: > > > hi all , > > > > i have a small doubt : Is it possible to have > > synchronization between processes running on > different > > processors in a SMP without any harware support > for > > that. I mean can we implement mutual exclusion in > > access of shared data without any 'lock ' prefix , > or > > atomic_swap , or atomic test_and_set instructions > in > > the instruction set of the machine. If yes then > How ?? > > > > > > Thanks, > > Rgds , > > Pankaj chauhan > > > > > > > > > ________________________________________________________________________ > > Yahoo! India Mobile: Download the latest > polyphonic ringtones. > > Go to http://in.mobile.yahoo.com > > -- > > Kernelnewbies: Help each other learn about the > Linux kernel. > > Archive: > http://mail.nl.linux.org/kernelnewbies/ > > FAQ: http://kernelnewbies.org/faq/ > > > > ________________________________________________________________________ Yahoo! India Mobile: Download the latest polyphonic ringtones. Go to http://in.mobile.yahoo.com -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
