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    SubjectRe: Alan Cox quote? (was: Re: accounting for threads)

    On 20-Jun-2001 Larry McVoy wrote:
    > On Tue, Jun 19, 2001 at 10:57:38PM -0400, Michael Rothwell wrote:
    >> On 19 Jun 2001 20:01:56 +0100, Alan Cox wrote:
    >>
    >> > Linux inherits several unix properties which are not friendly to good
    >> > state
    >> > based programming - lack of good AIO for one.
    >>
    >> Oh, how I would love for select() and poll() to work on files... or for
    >> any other working AIO mothods to be present.
    >>
    >> What would get broken if things were changed to let select() work for
    >> filesystem fds?
    >
    > I asked Linus for this a long time ago and he pointed out that you couldn't
    > make it work over NFS, at least not nicely. It does seem like that could
    > be worked around by having a "poll daemon" which knew about all the things
    > being waited on and checked them. Or something.
    >
    > I'd like it too. And I'd like a callback for iocompletion, a way to do
    > preread(fd, len).

    I'll be more than happy to have IO completion only at socket level.
    Something like :


    struct iocompletion ioc;

    fcntl(sfd, F_SETFL, fcntl(sfd, F_GETFL, 0) | O_NONBLOCK);

    ioc.event = IOC_READ;
    ioc.callback = data_ready;
    ioc.data = session_data;

    fcntl(sfd, F_ADDIOC, (long) &ioc);


    This would be pretty nice.




    - Davide

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