Re: How to interrupt a blocking call to snd_pcm_writei

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Florian Winter wrote:
> Suppose, an ALSA playback device is opened in blocking mode, and one
> thread calls snd_pcm_writei. If the snd_pcm_writei call blocks, because
> the internal buffer of the ALSA device is full, is there a way by which
> another thread can interrupt the call, so it returns immediately without
> writing any data to the device?

No.  As far as the user-space library is concerned, ALSA is not thread
safe.

You have to use non-blocking mode and poll() so that you can send a
message through a file descriptor (e.g. pipe or eventfd).


Regards,
Clemens

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