Can't set the schedual parameter of threads in linux

[Mark Hatle]

I'm far from an expert on pthreads..  but these sound like things that
require "nptl".  And as far as I know, nptl isn't exactly ready for the
ppc-embedded space.. :|

--Mark

Jaap-Jan Boor wrote:
>
> Yang,
>
> You are right, I don't use the pthread_[gs]etschedparam() functions.
> I use in the new thread's context the
> pthread_attr_getschedpolicy(&tattr, &policy);
> pthread_attr_getschedparam(&tattr, &param);
>
> functions, and then set the new priority
>
> param.sched_priority = newpriority;
> pthread_setschedparam(pthread_self(), policy, &param);
>
> Jaap-Jan
>
> On Mar 11, 2004, at 14:10, yang wrote:
>
>> Hi,
>>        I did run my program as root, and the key to my problem is why
>> it works well in Solaris system but not in Red Hat system.
>>        Please copy the follow codes and run it in your system if you
>> are spare and will. Thank you very much!
>>        Best regards,
>>                                                  yang
>>
>>
>>> yang,
>>>
>>> Are you running your application as root? Also, try to get/set
>>> the pthread schedule parameters in the pthread context itself.
>>>
>>> Jaap-Jan
>>>
>>> On Mar 11, 2004, at 2:06, yang wrote:
>>>
>>>>
>>>> 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
>>>>
>>>>
>>>
>>>
>>>
>
>
>
>


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