[alsa-devel] Player Thread is not woken after period elapsed

Arjan van de Ven arjan at infradead.org
Mon Sep 5 19:52:53 CEST 2011

On Mon, 5 Sep 2011 23:08:53 +0530
"Nallasellan, Singaravelan" <singaravelan.nallasellan at intel.com> wrote:

> Hi,
> When I tried to root cause a glitch in the audio playback, I found a
> weird behavior. 
> User thread which invokes the writei function which in turn  invokes
> a kernel function which waits for the free buffer to write the audio
> data.  This kernel function adds this thread to a wake(sleep) queue
> and calls a schedule_timeout (msecs_to_jiffies(10000)).

actually it doesn't... you must be on some really really old kernel or

> Will you provide some hint on how to go about identifying the root
> cause?


Arjan van de Ven 	Intel Open Source Technology Centre
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