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

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

Anders Torger wrote:
> 
> On Monday 07 October 2002 14.07, you wrote:
> > Takashi Iwai wrote:
> > > it CAN happen if you have multi-threads.
> > > the problem is that we have no option to block the poll.
> >
> > If you have multi-thread you have other alternative to do that.
> > OTOH application can't detect *why* poll is blocking with the change
> > you advocate.
> 
> This is a non-issue. I think it is larger risk to search for the wrong
> problem (like I did), that is beleiving that there is a buffer underrun
> or similar. This type of blocking bug is very easy to detect and debug,
> I don't think the bug-detection argument is important, and that is also
> the only argument for the current behaviour (apart from that it is bad
> to change APIs).

I'm not speaking about programming bugs. Suppose the PCM is stopped by
another thread: you're screwed.
 
> > > > That apart I'm sure that to make a change in actual behaviour
> > > > between rcX and 1.0 is a professional suicide. However it's
> > > > _your_ professional suicide so... ;-)))
> > >
> > > yes, i know it well ;)
> > >
> > > i don't like to change this inevitably, too.
> > > and as mentioned above, i don't mind to add an option as sw_params,
> > > etc. for the new behavior.
> > >
> > > but the current behavior is incorrect from the interpretation of
> > > POSIX.  so this must be a bug.
> > > if we have to change it, then i would choose the new one, because
> > > it's more intuitive without exception.
> >
> > As pointed by Clemens the current is the proper POSIX behaviour.
> 

Perhaps you should reread Single Unix Specification, I quote
http://www.opengroup.org/onlinepubs/007904975/functions/poll.html

POLLIN 
            Data other than high-priority data may be read without
blocking. 


POLLOUT 
            Normal data may be written without blocking. 


No data may be read/written in current stream state in the case we are
discussing.


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

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


-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Welcome to geek heaven.
http://thinkgeek.com/sf