Can't set the schedual parameter of threads in linux

[Jaap-Jan Boor]

On Thu, 11 Mar 2004, Jean-Denis Boyer wrote:

>
> Your program logic is absolutely correct.
> I ran it in my embedded PPC environment (as root) and got the following results:
>
> policy: 2       priority: 20
>
> The problem is elsewhere...

RedHat 9 uses ntpl, that is a difference.

>
> --------------------------------------------
>  Jean-Denis Boyer, Eng.
>  M5T Centre d'Excellence en Télécoms Inc.
>  4283 Garlock Street
>  Sherbrooke (Québec)
>  J1L 2C8  CANADA
>  (819)829-3972 x241
> --------------------------------------------
> > -----Original Message-----
> > From: owner-linuxppc-embedded at lists.linuxppc.org
> > [mailto:owner-linuxppc-embedded at lists.linuxppc.org]On Behalf Of yang
> > Sent: 10 mars, 2004 20:07
> > To: linuxppc-embedded at lists.linuxppc.org
> > Subject: Can't set the schedual parameter of threads in linux
> >
> >
> >
> > Hello,
> >     I encounter a problem when I transplant application.
> >     There is no effect to the pthread when I call
> > pthread_setschedparam() function in test program,  and it's
> > policy and priority are stilll zero, not what I expected,
> > after call pthread_getschedparam(). The codes  is as the follow:
> >
> > #include <sched.h>
> > #include <pthread.h>
> > #include <stdio.h>
> > #include <stdlib.h>
> > #include <sys/types.h>
> > #include <linux/ipc.h>
> > #include <linux/msg.h>
> > #include <errno.h>
> > #include <stddef.h>
> > #include <string.h>
> >
> > void * func()
> > {
> >         while (1);
> >     return;
> > }
> >
> > int main()
> > {
> >     pthread_attr_t tattr;
> >     pthread_t tid;
> >     int policy;
> >     int ret;
> >     int newprio = 20;
> >     struct sched_param param;
> >
> >     ret = pthread_attr_init (&tattr);
> >     if (ret != 0)
> >     {
> >         printf("Error in init: %s\n", strerror(errno));
> >     }
> >
> >     ret = pthread_attr_getschedparam (&tattr, &param);
> >     if (ret != 0)
> >     {
> >         printf("Error in get after init: %s\n", strerror(errno));
> >     }
> >     ret = pthread_attr_setdetachstate(&tattr,
> > PTHREAD_CREATE_DETACHED);
> >    if (ret != 0)
> >     {
> >         printf("Error in setdea: %s\n", strerror(errno));
> >     }
> >     ret = pthread_attr_setschedpolicy(&tattr, SCHED_RR);
> >     if (ret != 0)
> >     {
> >         printf("Error in setpolicy: %s\n", strerror(errno));
> >     }
> >
> >     param.sched_priority = newprio;
> >     ret = pthread_attr_setschedparam (&tattr, &param);
> >     if (ret != 0)
> >     {
> >         printf("Error in set: %s\n", strerror(errno));
> >     }
> >
> >     ret = pthread_create (&tid, &tattr, (int*) func, NULL);
> >     if (ret != 0)
> >     {
> >         printf("Error in create: %s\n", strerror(errno));
> >     }
> >
> >     param.sched_priority = -1;
> >     ret = pthread_getschedparam (tid, &policy, &param);
> >     if (ret != 0)
> >     {
> >         printf("Error in get after create: %d %s\n", ret,
> > strerror(errno));
> >     }
> >
> >     printf("policy: %d\tpriority: %d\n", policy,
> > param.sched_priority);
> >
> >     return 0;
> >
> > }
> >
> >     The output is :
> >     policy: 0    priority: 0
> >
> >     Would you like to tell me how to set the policy and
> > priority to pthreads in Red Hat.? Thank you very much!
> >     Best regards,
> >                                      yang
> >
> >
>
>
>

--
J.G.J. Boor			  Anton Philipsweg 1
Software Engineer		  1223 KZ Hilversum
AimSys bv              		  tel. +31 35 689 1941
Postbus 2194, 1200 CD Hilversum   mailto:jjboor at aimsys.nl


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