Question

Set priority for PThread on Linux platform

Asked by: rfr1tz

Hi,

I'd like to set priority levels for PThread on Linux platform. For my PThreads, there are 2 groups, one is real-time that needs to be higher priority and others (non-real-time) that can run at lower priority.

If you can, please give help and show me how to set priority levels for these 2 groups. If you can give me a piece of code as examples that set prirority levels for PThreads, It's superb.

Thanks for any help,

Rfr1tz

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Asked On
2004-06-06 at 08:10:42ID21015097
Tags

linux

,

pthread

,

priority

Topic

Linux Programming

Participating Experts
2
Points
250
Comments
8

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Answers

 

by: sunnycoderPosted on 2004-06-06 at 22:20:34ID: 11246267

You need superuser permissions for this ... you can change the priority of a thread by modifying the sched_priority field of the sched_param structure
use pthread_setschedparam() for this

 

by: manish_regmiPosted on 2004-06-06 at 23:31:11ID: 11246452

hi rfr1tz,
 As you said one thread should be RT and other is non RT.
For RT,
 You need to give the scheduling policy, tid and sched_priority.
1) RT thread.(here i am giving max priority, u can give any)
also it needs su priority.
RT thread can have SCHED_FIFO or SCHED_RR policy.

...
struct sched_param p;
p. sched_priority= sched_get_priority_max(SCHED_RR);
pthread_setschedparam(pthread_self(), SCHED_RR, &p);

2:) leave it as it is. Default priority will be ok.
But if you want to change, it is similar as above.
give it SCHED_OTHER policy and some priority you like.

regards manish

 

by: rfr1tzPosted on 2004-06-09 at 08:07:37ID: 11270674

Hi all,

Thanks so much for your info,

To set the priority of the thread, what I plan to do is:

--> set the prirority of the thread inside a method, say start
--> Then when I create the thread, I plug the "start" function into the 3rd argument of pthread_create as follows:
pthread_create(&epThread, &attributes, start, tinfo)

Do you think it is OK?

Thanks,

Rfr1tz

 

by: rfr1tzPosted on 2004-06-09 at 15:27:37ID: 11274936

Hi sunnycoder:

You mentioned about "superuser" permission. The code I wrote belongs to a program. It is a program/process. How can we set the privilege of a program/process? And if we want to retrieve the privilege level of a program, how can we do it?

Thanks a lot,

Rfr1tz

 

by: manish_regmiPosted on 2004-06-09 at 22:47:30ID: 11276436

hi,
--> set the prirority of the thread inside a method, say start
--> Then when I create the thread, I plug the "start" function into the 3rd argument of
-->pthread_create as follows:
-->pthread_create(&epThread, &attributes, start, tinfo)

start()
{
       struct sched_param p;
       p. sched_priority= sched_get_priority_max(SCHED_RR);
       pthread_setschedparam(pthread_self(), SCHED_RR, &p);
}

Yes, That is exactly you should do. You can also do at other place if you know tid.

Superuse permission means the user who runs this program.
so, Only user running as root can run this program.

For others, the function will return -1.

regards manish

 

by: sunnycoderPosted on 2004-06-10 at 01:38:23ID: 11277207

>You mentioned about "superuser" permission. The code I wrote belongs to a program. It is a program/process. How can we
>set the privilege of a program/process? And if we want to retrieve the privilege level of a program, how can we do it?

chmod u+s will allow anyone to run this program with superuser priv (the owner of the executable should be root) ... be careful while using this command ... It allows superuser priv to ordinary users

ls -l will display the permissions of the program

for getting the information within the program, use

getuid()
geteuid()

refer to their man pages for more information

20120131-EE-VQP-002

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