On Thu, 22 Mar 2018 16:17:10 +0100,
Wischer, Timo (ADITG/ESB) wrote:
>
> > I don't understand. The pulse plugin calls pa_stream_drain(), and
> > pulse_wait_operation() to wait until the drain finishes. What does it
> > have to do with threading?
>
> As far as I understand you patch io->data->callback->drain() will not be called in nonblocking mode.
> + if (io->data->state == SND_PCM_STATE_DRAINING) {
> + if (io->data->nonblock)
> + return -EAGAIN;
> +
> + if (io->data->callback->drain) {
> + err = io->data->callback->drain(io->data);
> + if (err < 0)
> + return err;
> + }
> + }
>
> Therefore how should call pa_stream_drain() in case of nonblocking mode?
The application needs to sync manually via poll() instead.
It's also the behavior of the kernel driver, which ioplug follows.
Takashi
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