On Tue, Mar 11, 2003 at 10:20:38AM -0800, Davide Libenzi wrote:
> > Most programs will not abandon 'legacy' interfaces like poll and select and
> > will only want to offer epoll in addition. Right now that is hard to do.
>
> I agree here. It took 15 minutes to port thttpd to LT epoll.
Having level ability will massively speed up epoll adoption. By the way, was
there a reason to go to edge in the first place?
> I received a bunch of private emails ( ppl that are using ET epoll )
> asking me to have both behaviours. The code require no more than 10 lines
> of code to give both possibilities. We have two options in doing that :
Impressive.
> We add a parameter to epoll_create() that will set the interface behaviour
> at creation time :
...
> We can go at fd granularity by leaving the API the same, and we define :
> #define EPOLLET (1 << 31)
This last option would retain the current ABI *and* semantics for unchanged
programs. I do wonder if there is a case where you'd want to run in mixed
mode, however. But if the code to support mixed operation is truly trivial,
I think we should not set policy from the kernel ('only do epoll in one
mode') and leave it up to userspace to discover if there is a use for this.
Anyhow, as a member of the kCowSay [1] association of userspace people
meddling in the affairs of kernel coders, I vote strongly for having level
triggered epoll on the kernel, with the ability to do mixed mode.
Regards,
bert
[1] Founded by John Levon on the assumption that kernel coders assume all
userspace code to be trivial, so we should have a massively trivial
name. kCowSay tries to educate kernel deities about the needs of us
userspace dwellers.
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