[alsa-devel] [PATCH 2/2] add API to allow disabling period interrupt

[pl bossart]

> I see two ways:
>
> 1) leave set/get functions with this semantics:
>   - application tries to set the no period update behaviour for hw_params
>     - alsa-lib should check if nonblock flag is set at this moment
>   - snd_pcm_hw_params() call
>   - application reads back the no period update state and if the flag is
>     not set, it will use standard period updates
> 2) create new optional snd_pcm_open flag
>   - application opens device with nonblock and no period update flags
>   - snd_pcm_hw_params() call
>   - application reads back the no period update state and if the flag is
>     not set, it will use standard period updates
>
> Note that we can even implement both methods together like for handling the
> nonblock behaviour.

I re-implemented the first solution and checked if the mode is indeed
non-blocking. This solution assumes that the apps cannot go back to
blocking mode at a later stage. Is it a valid asumption, or can the
blocking mode be enabled/disabled at any time with snd_pcm_nonblock()?
-Pierre