Re: Why do I get broken pipe on write to a pcm in statePREPARED?

[Abramo Bagnara <abramo.bagnara@libero.it>]

Takashi Iwai wrote:
> 
> At Sun, 15 Sep 2002 19:56:59 +0200,
> Abramo Bagnara wrote:
> >
> > Jaroslav Kysela wrote:
> > >
> > > I think that the current behaviour of write() is ok, the behaviour of
> > > poll() might be "fixed". I see advantages for both. I would prefer to have
> > > this configurable to satisfy multi-threaded applications. We can put a new
> > > variable to sw_params.
> >
> > Implementing that specific behaviour for poll I've paid most attention
> > to efficiency issues.
> >
> > Consider that if you choose a differente behaviour for poll you're
> > forced to check for xruns (i.e. enter kernel space) just before *every*
> > poll!
> 
> well, the origianl question was the behavior of poll at the prepare
> (and pause) state, so the theme has nothing to do with xruns (it
> cannot happen :)
> 
> the behavior of poll at other states should be as well as before.
> 

I think that the best behaviour is the current and it's also the
simplest to describe and to understand: poll/select never blocks when
there is nothing to wait.

... and in PREPARED state definitely there's nothing to wait from sound
card.

-- 
Abramo Bagnara                       mailto:abramo.bagnara@libero.it

Opera Unica                          Phone: +39.546.656023
Via Emilia Interna, 140
48014 Castel Bolognese (RA) - Italy


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