[alsa-devel] [Pkg-alsa-devel] Bug#438118: alsa-utils: aplay non-blocking mode isn't working

Anders Boström anders at netinsight.se
Fri Dec 14 11:37:36 CET 2007

>>>>> "TI" == Takashi Iwai <tiwai at suse.de> writes:

 TI> OK, thanks, I see the problem now.
 TI> I don't remember whether it's a feature or a bug.  The drain ioctl
 TI> rejects the non-block mode.
 >> I can understand the idea here, that in non-blocking mode, no call
 >> should block, ever. But on the other hand, if you call the drain
 >> ioctl, you probably expect it to work, even in non-blocking mode. Why
 >> would you otherwise call it?

 TI> Yes, that's my opinion, too.  This particular ioctl is to block the
 TI> operation, so it should be allowed as long as it's called.

 TI> But I vaguely remember that we discussed about it, and the current
 TI> form is the result of that.  Namely, we can call
 TI> snd_pcm_nonblock(FALSE) explicitly before calling snd_pcm_drain().

 TI> Though, I prefer fixing the behavior in the core side to allow the
 TI> blocking with this call...  Any reasonable objections in mind?

Any progress in including a solotion to this bug in mainstream
alsa & linux kernel? Has anything been done? The patch works fine for

/ Anders

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