On Mon, 1 Jul 2002, Joshua Haberman wrote:
> On Mon, 1 Jul 2002, Joshua Haberman wrote:
> > > This gives me the impression that snd_pcm_poll_descriptors_revents() is a
> > > function that somehow "summarizes" all of the pfds into a single revents
> > > that speaks to the status of the entire PCM handle.
>
> * Paul Davis ([EMAIL PROTECTED]) wrote:
> > I don't use this function at all, considering it something of it a
> > band-aid.-
>
> * Jaroslav Kysela ([EMAIL PROTECTED]) wrote:
> > Yes, it translates multiple revents into one for application. Please, use
> > this function for the library flexibility.
>
> Hmm. What do I do now? :-)
>
> Jaroslav, is it true what Paul says about this function not being robust
> in the case of multithreaded use and poll(2) errors? Can it be made to
> be more robust?
Paul talks about snd_pcm_wait() function. True, it has limited
functionality and can be used only for simple applications.
> Looking at the implementation I infer that
> snd_pcm_poll_descriptors_revents() is not designed to handle pfds from
> more than one stream. Is that correct?
Yes, but don't look to the implementation. It can slightly change in the
future. The wait_for_poll() function in alsa-lib/test/pcm.c does really
the correct poll sequence, so use this code and don't try to do things
differently than designed like Paul often does ;-)
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project http://www.alsa-project.org
SuSE Linux http://www.suse.com
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