Re: snd_pcm_close hangs

[Takashi Iwai <tiwai@suse.de>]

At Tue, 4 Jun 2002 23:10:20 +0200 (CEST),
Tim Goetze wrote:
> 
> Takashi Iwai wrote:
> 
> [...]
>  
> >so far, so good..
> >
> >> calling snd_pcm_close() takes a few seconds during which i see
> >> this:
> >> 
> >> [~] cat /proc/asound/ice/pcm0p/sub0/status 
> >> state: DRAINING
> >> trigger_time: 1023125380.999721
> >> tstamp      : 1023125381.905192
> >> delay       : -39746
> >> avail       : 40002
> >> avail_max   : 40002
> >> -----
> >> hw_ptr      : 40002
> >> appl_ptr    : 256
> >
> >the minus delay value is definitely wrong.
> >something weird goes there...
> >could you check sw_params during this happens?
> 
> yes i could, but i won't if you don't insist (they don't change anyway
> iirc). instead i have done some more investigations:
> 
> remember capture + play are linked, and audio data has been written. 
> now draining the playback stream *always* fails in the way already
> described.
 
oh, then it's related with the linkage...

> consequences: if you close capture first and then playback, things
> work ok. if you unlink the streams before closing them, things work
> ok, and the order of closing does not matter.
> 
> i have attached testing boilerplate code that you can use to 
> reproduce the error.

thanks, i'll test this later.


Takashi

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