[linux-audio-dev] thread priority question

[Paul Davis]

>Is there an equivalent to sched_setscheduler() that adjusts thread priority in
>stead of process priority?  I want my audio thread to be higher priority than 
>my drawing thread.  Both threads are part of the same app (process).  Is this 
>possible in Linux v2.5?

from the source code of jack/libjack/client.c

	if (pthread_attr_setschedpolicy (attributes, SCHED_FIFO)) {
		jack_error ("cannot set FIFO scheduling class for RT thread");
		return -1;
	}

	if (pthread_attr_setscope (attributes, PTHREAD_SCOPE_SYSTEM)) {
		jack_error ("Cannot set scheduling scope for RT thread");
		return -1;
	}

	memset (&rt_param, 0, sizeof (rt_param));
	rt_param.sched_priority = client->engine->client_priority;

	if (pthread_attr_setschedparam (attributes, &rt_param)) {
		jack_error ("Cannot set scheduling priority for RT thread (%s)", strerror (errno));
		return -1;
	}