On Friday 28 January 2005 11:14, Bahadir Balban wrote: > Hi, > > I'm asking this in context of a simple device driver. In the general > implementation of poll(), the wait_queue's in the driver that can > wake up the current process and change the current poll condition are > added to a poll_table via poll_wait(). > > Why do we need this? If I was to implement poll() I would simply > check the status of the driver and return the result, and if some > other process would change the poll condition of the device, in my > thinking this would be resolved in the next poll() call. I think you may be confusing poll() the system call with polling in a hardware sense. poll() just doesn't check for pending data and then return. It will also block if none of the poll conditions are true. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
