Re: Changing priority of threads

Hi Raseel,
   I tried that idea, but I get the same exception. In fact I found
that whenever I am trying to access data structure is from one thread
to the other thread ( except shared memory ) I find that exception. I
have no clue what is the possible reason.

  If anyone knows any solution or have faced this scenario before,
please let me know.

thanks,
santanu


On 1 Dec 2004 04:51:15 -0000, Raseel  Bhagat
<[email protected]> wrote:
> 
> 
>   Maybe after you reset the thread priority of t2(based on your condition),
> when the control goes back to f2, it finds that the thread priority is
> supposed to be 3 and not 8.
> 
> I think thats what creating the confusion.
> Why don't you set the t2 priority the first time also from f1 and then as
> and when the condition changes, the priority is changed to the new priority
> of 5 from f itself?
> 
> Thanks,
> Raseel
> 
> On Tue, 30 Nov 2004 Santanu Chatterjee wrote :
> 
> 
> >Hi folks,
> >    I have a small application running, in which I have two real-time
> >threads. One has a higher priority than the other one. From the high
> >priority thread I wanna change the priority of the low priority thread
> >to make it a high priority one, so that the low priority thread will
> >get the CPU.
> >
> >  Can anyone please advise me how it could be done?
> >
> >What I did:
> >
> >//global definition
> >pthread_t t1, t2;
> >struct sched_param p1, p2;
> >
> >in the init module:
> >pthread_create(&t1, NULL, f1, 0);
> >pthread_create(&t2, NULL, f2, 0);
> >
> >Inside f1(High priority):************************
> >p1.sched_priority = 5;
> >pthread_setschedparam(pthread_self,SCHED_FIFO, &p1);
> >
> >.........
> >    //change priority of thread t2
> >    p2.sched_priority = 8;
> >    pthread_setschedparam(t2, SCHED_FIFO, &p2);
> >
> >........
> >
> >Inside f2(low priority):***************************
> >p2.sched_priority=3;
> >pthread_setschedparam(pthread_self(), SCHED_FIFO, &p2);
> >......
> >
> >I am finding thread exception whenever I am trying to access and set
> >scheduling information of t2 from t1. Basically what I want are 2
> >threads( one is higher and one with lower priority) and after some
> >time, based on a condition I wanna change the low priority thread to
> >high priority and vice-e-versa. I am new in rtlinux programming.
> >I couldn't find similar example with rtlinuxfree distribution. I would
> >highly appreciate any help.
> >
> >thanks,
> >santanu
> >_______________________________________________
> >Rtl mailing list
> >[email protected]
> >http://www2.fsmlabs.com/mailman/listinfo/rtl
> 
> 
> Raseel Bhagat
> 
>
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