How to change scheduling algorithms?

mike_qnx6 · November 11, 2005, 8:36am

Hi Community

how is it possible to change between different sheduling algorithms
in Neutrino and in QNX4.

Thank You

mario · November 11, 2005, 12:28pm

In both OSes it’s sched_setscheduler()

mike_qnx6 · November 11, 2005, 2:12pm

Thank You mario !!!

mario · November 11, 2005, 3:41pm

You’re welcome ;-)

mike_qnx6 · November 11, 2005, 5:24pm

I try it with
…
#include <sys/shed.h>
…
struct shed_param myshed;
…
sched_setscheduler(getpid(),SCHED_RR,&myshed);
…

…
but sin shows sheduling is always on default 10o (others)
why???

Thank You

mario · November 12, 2005, 3:12am

Are you checking the return value of the function, if so what about errno.

Are you filling myshed with proper value, you might read it back with sched_getscheduler() if you don’t plan on changing the priority…

mike_qnx6 · November 12, 2005, 1:54pm

Thank you mario !!!

Yes I’dont initialisize the “sched_priority” described in sched.h because I’dont see the exigence of this.
After doing this, all works perfect.

Thank You !!!