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List:       linux-rt
Subject:    Re: [rtl] Task brings the host down
From:       yodaiken () fsmlabs ! com
Date:       2000-08-27 10:15:55
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What is the definition of "SPEED"

On Fri, Aug 25, 2000 at 08:20:54PM -0700, OMILL@ewu.edu wrote:
> Hello :
>  I have a simple thread running on my rt linux box. I have made this 
> thread as 
>    pthread_attr_init (&attr);
>    sched_param.sched_priority = 4;
>    pthread_attr_setschedparam (&attr, &sched_param);
>    ret = pthread_create (&mem_tasks[1],  &attr, thread_stimulate_code, (void *)
>   printk ("init_module : test2\n");
>    if (ret !=0)
>            {
>            rtl_printf ("failed to create the second thread \n");
>            return -1;
>            }
>    printk ("init_module : test3\n");
> 
>   rtl_no_interrupts (flags);
> 
>    if ( pthread_make_periodic_np( mem_tasks[1],  gethrtime(), SPEED*300000000 )
>           printk ("\n MEM Thread 2 is periodic now\n");
> 
> 
>        // zonk out the thread so it can be woken up by the code
> 
>         pthread_suspend_np ( mem_tasks[1]);
>         rtl_restore_interrupts (flags);
> 
> Now, what is does   is
> void *thread_stimulate_code(void *t)
> //send request for read from rt_tulip
> {
> int i ;
> 
>  struct my_msg_struct msg;
>  msg.command= RCV_FRM;
>  msg.length = sizeof (msg);
> 
>   pthread_wakeup_np (mem_tasks [1]);
> 
> while (1)
>     {
>                    int ret = pthread_wait_np();
>                                         // end execution until the next period
>                      //  while(test_bit(0,(void *)&rtn_change_dest_flag));
>                      //  rtf_put (CTL_PIPE, &msg, sizeof(msg));
>                          rtl_printf ("Got the Data: stimulate code \n");
> 
>      }
>         return 0;
> }
> 
> 
> 
> My questions is :
>     Why does it bring the host to its knees ?
> I thought int ret = pthread_wait_np(); would put to sleep for a while.
> How can I make this task less active ?
> Thank you ,
> Olga
> -- [rtl] ---
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> ---
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-- 
---------------------------------------------------------
Victor Yodaiken 
Finite State Machine Labs: The RTLinux Company.
 www.fsmlabs.com  www.rtlinux.com

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---
For more information on Real-Time Linux see:
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