Re: IO plugin and multiple poll descriptors

[Takashi Iwai <tiwai@suse.de>]

At Tue, 17 May 2005 15:03:35 +0200,
Marcel Holtmann wrote:
> 
> Hi Takashi,
> 
> > > for the IO plugin we can specify one descriptor for poll().
> > > 
> > > 	io.poll_fd = fd;
> > > 	io.poll_events = POLLIN;
> > > 
> > > I like to use more than one, because in the Bluetooth cases I always
> > > have to deal with a signal and a separate media channel. Is it possible
> > > to add support for that or do I must work around it.
> > 
> > Currently, the alsa-lib handles only one poll_fd internally although
> > API allows the multiple poll_fds.  So, it's not quite easy to add the
> > multiple fds...
> 
> are there any plans to change this in the future?
> 
> Maybe it is a good idea to retrieve the poll_fd through a callback. I
> think of something like you already do in the library:
> 
> 	poll_descriptors(snd_pcm_ioplug_t *io, struct pollfd *pfds)
> 	poll_descriptors_count(snd_pcm_ioplug_t *io)
> 
> Or do you have a good idea on how to workaround it?

I agree, adding the appropriate new callbacks would be the simplest
solution.  I'll implement it soon if no one is against it.


Takashi


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