Re: [PATCH] async poll for 2.5

[Davide Libenzi]

On Wed, 16 Oct 2002, John Gardiner Myers wrote:

> Davide Libenzi wrote:
>
> >I knew you were going there, aka you do not understand how edge triggered
> >API have to be used.
> >
> Nonsense.
>
> >Even if the API will drop an event at registration
> >time you still cannot use this code scheme :
> >
> >int my_io(...) {
> >
> >	if (event_wait(...))
> >		do_io(...);
> >
> >}
> >
> >You CAN NOT. And look, it is not an API problem, it's your problem that
> >you want to use the API like a poll()-like API.
> >
> You have insufficient basis upon which to claim I would write code as
> broken as above.

Yes I have, look down 15 lines ...

> >This because you have to consume the I/O space to push the level to 0 so
> >that a transaction 0->1 can happen and you can happily receive your
> >events.
> >
> >
> Of course you have to consume the I/O space to push the level to 0.
>  What do you think I am, stupid?
>
> This is done with something like:
>
> for (;;) {
>      fd = event_wait(...);
>      while (do_io(fd) != EAGAIN);
> }

I told you did not understand the API, this code won't work for edge
triggered APIs. Please consider investigating a little bit more before
shooting to perfectly working APIs.

- Davide