Re: [alsa-devel] snd_pcm_drain and lockups

At Tue, 4 Sep 2007 23:03:27 +0200, Arve Knudsen wrote:

Hello

Users of the PortAudio library on top of ALSA-lib have reported that it may hang in a call to snd_pcm_drain. I have also been able to confirm that this can happen in conjunction with the dmix device at least. Can the ALSA developers please tell me how, if at all, snd_pcm_drain may be safely used? Is this function simply best avoided (snd_pcm_drop being the alternative)?

Of course, it's supposed to be safe to use :) But, it's hard to tell you more unless I get the details in your case...

In which situation is it called? Are they multi-threaded?

Takashi