[linux-audio-dev] Realtime problems with midi/osc sequencer

[Christian]

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Dmitry Baikov schrieb:
> In addition to select() there's also clock_nanosleep(CLOCK_MONOTONIC,
> 0, &tv, NULL), which in theory should give best resolution possible.
> 
> To set realtime privileges, use (taken from jack):
> 
> struct sched_param rtparam;
> memset (&rtparam, 0, sizeof (rtparam));
> rtparam.sched_priority = priority;
> pthread_setschedparam (thread, SCHED_FIFO, &rtparam);
> 
> 
> 
> Interesting project, btw. I planned to start something like this myself.
> 
> Please, publish results of your timing experiments - very interesting!
> 
> 
> Dmitry.
> 
> 
Taken your code to set the thread to realtime I now get very exactly 78
bpm which don't change much.
On the one hand this indicates the thread running stable in realtime but
having a restriction to ~4ms/4000µs. Perhaps this is an in-system value
of sleep and the select approach Robin Gareus posted will help out.
Christian

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