Hi, Thank you for fast reply. On 1/12/06, Thomas Petazzoni <thomas.petazzoni@xxxxxxxx> wrote: > > I've implemented driver, which waits for some event from external > > device. When this event comes, i should notify ASAP my user-space > > application from kernel to achieve the fastest reaction. Now i am > > using only signals and i don't know what i can do else. Can you advice > > me something ? Thank you! > > If your application is waiting an event from a device, then it means > that it called something like read(), write() or ioctl() which are then > implemented in the kernel space driver. These functions can sleep in the > kernel space driver until the event occurs. Then, they are unblocked and > the userspace process can continue its execution. Yes, exactly! But im my case, user-space application does another background work everytime. It has own timetable with some events. In infinite loop this application checks for next point execution time and executes corresponding events. My driver is working concurrently with this application. Driver is waiting for some external events, and if they occure, it informs the application about this event using signal. When the application catches this signal, it asks for driver about occured event using ioctl function, schedules this event in own timetable and continues execution. Sorry for such careless description, but i hope you'll understand what i mean. Thus i can't use the blocking IO operations like you offered above. And i don't know how to make this communication faster and in more efficient way. Thank you! With best regards, Sergey Semionov -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
