Re: [rfc] new poll callback'd wake up hell ...

[Davide Libenzi]

On Mon, 25 Nov 2002, John Myers wrote:

> Davide Libenzi writes:
>  > 1) Move the wake_up() call done inside the poll callback outside the lock
>
> You can't.  You need to hold the lock over the callback or your callback
> could end up accessing a freed epitem.

No, look at the code :

http://www.xmailserver.org/linux-patches/sys_epoll-2.5.49-0.58.diff

The function ep_collect_ready_items() increases the usage count under
lock. So the epintem is protected, and the file* cannot desappear because
of the read lock on epsem.

- Davide