On 21 September 2011 16:09, geoffrey levand <geoffrey.lev...@mail.ru> wrote: > Sure i can use the synchronization primitives, the problem is that the > response to a request sent to PS3 VUART port is not > available immediately, and i have to disallow kernel access to the PS3 VUART > while i'm waiting for the response in user > space. I send request with write syscall from user space and wait for > response with read syscall. In the period of time > between sending request and receiving response i could receive some other > packets from VUART port, e.g. some kind of > event notification, i have to skip them. But kernel should not interfer > until i get my response. > So i would need to lock out the kernel during this time. I think i found a > good solution for this problem, just use a IOCTL > which tells kernel device driver to stop processing kernel requests and > events, something like SET_USER_MODE. > After that i can use it in user space.
Have you read sema(9)? Or if returning EBUSY is acceptable when the resource is in use by $whatever, maybe you just need a boolean variable. _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
