On 4/28/05, Manish Regmi <regmi.manish@xxxxxxxxx> wrote: > On 4/28/05, Gaurav Dhiman <gaurav4lkg@xxxxxxxxx> wrote: > > please let me know how these two statements are made atomic across the > > CPU, i think these two need to be atomic across the CPU for actually > > locking the rw lock for reading. What does "lock ;" specifices here. > > hi, > Lock is an opcode prefix used for atomicity in i386 . so, that memory > is only used by one processor at a time. > > AFAIK, it asserts LOCK# which locks the bus. Thanks .... how we mention till what instruction the lock will be there. Is there any unlock prefix also to specifically unlock it, or it unlocks after executing the next one or two instructions. > regards > Manish Regmi > > -- > --------------------------------------------------------- > "Owning a hammer doesn't make one an architect" > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
