On Thu, 13 Nov 2008, Tejun Heo wrote:

quoted text
> Hmm... yeah, allocating handle from kernel should work fine, but I
> wouldn't worry about race here.  We can just use 64 bit and guarantee
> that any handle won't be reused ever.

Btw, the protocol could be simplified even more by getting rid of all
acknowledgements:

<- POLL-request(pollhandle) (alloc handle)
...
-> POLL-notification(pollhandle)
...
<- POLL_RELEASE(pollhandle)

So normally ->poll() wouldn't have to sleep at all.  If the POLL
request fails for some reason, userspace just sends a notification
with the respective error.

Miklos
--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/