Re: SND_PCM_ASYNC - why???

[James Wright <james@jigsawdezign.com>]

On Mon, 19 Jan 2004 20:07:51 +0100
Takashi Iwai <tiwai@suse.de> wrote:

> At Sat, 17 Jan 2004 11:26:45 +0000,
> James Wright wrote:
> > 
> > Hello,
> > 
> >   I'm doing much better with ALSA now that i spent a coule of days messing with code. I've got both direct
> > MMAP PCM playback and a fallback using normal write access with no problems. However, i've
> > just written in asyncronous notification support and found that if i use the SND_PCM_ASYNC flag in snd_pcm_open()
> > and then setup my callback function with snd_async_add_pcm_handler(), then the callback function is not called!
> > When i remove the SND_PCM_ASYNC flag it works fine, so is this flag/mode redundant? 
> 
> snd_async_add_pcm_handler() sets/resets the O_ASYNC flag by itself, so
> basically you don't need to open the pcm with SND_PCM_ASYNC.
> 
> 
> Takashi


Be nice if the docs mentioned this! Surely anyone that wants to use asynchornous notification will call
snd_async_add_pcm_handler() at some point, so there is no real need for the SND_PCM_ASYNC flag...



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