30 Apr
2003
30 Apr
'03
2:31 p.m.
Is there an equivalent to sched_setscheduler() that adjusts thread priority instead 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?
30 Apr
30 Apr
2:51 p.m.
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;
}
3:01 p.m.
On Wed, Apr 30, 2003 at 11:20:40 -0500, Ben Loftis wrote:
Is there an equivalent to sched_setscheduler() that
adjusts thread priority instead 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?
sched_setscheduler() works on threads too.
- Steve
3:40 p.m.
On Wednesday 30 April 2003 18.50, Steve Harris wrote:
On Wed, Apr 30, 2003 at 11:20:40 -0500, Ben Loftis
wrote:
I think the proper way is to use pthread_setschedparam(). I haven't
tested recently, but I think this function works as expected in current
Linux 2.4.
/Anders Torger
Is there an equivalent to sched_setscheduler()
that adjusts thread
priority instead 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?
sched_setscheduler() works on threads too.
- Steve 
8:53 p.m.
On Wed, Apr 30, 2003 at 11:20:40 -0500, Ben Loftis
wrote:
> Is there an equivalent to sched_setscheduler() that adjusts thread
priority
instead 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?
sched_setscheduler() works on threads too.
No, it does not. You need pthread_attr_setschedparam() to change
a thread's priority. Perhaps sched_setscheduler worked with
linuxthreads because it is not POSIX compliant since every thread
has a different pid, but with NPTL this is no longer the case.
--ms
7667
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linux-audio-dev@lists.linuxaudio.org
4 comments
5 participants
participants (5)
-
Anders Torger -
Ben Loftis -
Martijn Sipkema -
Paul Davis -
Steve Harris