Re: [ECOS] about timeslice and same priority thread switch.

["yyl" <ylyuan at csrd dot org>]

 

----- Original Message -----

From: Jonathan Larmour <jlarmour@redhat.co.uk>

To: yyl <ylyuan@csrd.org>

Cc: ecos <ecos-discuss@sourceware.cygnus.com>

Sent: Wednesday, May 31, 2000 5:47 AM

Subject: Re: [ECOS] about timeslice and same priority thread switch.

> > yyl wrote:
> >
> > Hi, after finished building the ecos1.3.1 on Redhat linux6.1(target is pc
> > x86),I use gdb stub and the example twothreads.c to test.
> > From the document and the code of kernel,I think the threads of same
> > priority should switch by timeslice.But after comment the sentence in
> > twothreads.c as followed:
> >           cyg_thread_delay(200);
> > I find no switch.Who can tell me why?
>
> So you are saying that by changing the code to the following, it stops
> working?

  
     It working.I mean the threads execute in the turn which they resume,but not switch by timeslice,ie,only the first thread finished ,the second thread can start.The code I modified as followed(I comment two sentences):

     /*        cyg_thread_delay(200);  */

             for (i=0;i<=100;i + +) {
          delay = 200 + (rand() % 50 )

         /* note: printf() must be protected by a
               call to cyg_mutex_lock() */
            cyg_mutex_lock(&cliblock); {
           printf("Thread %d: and now a delay of %d clock ticks\n",
                 message, delay);
             }
           cyg_mutex_unlock(&cliblock);
           /* cyg_thread_delay(delay); */

 

 the result of the run:

          Entering twothreads' cyg_user_start() function

          Thread 0 and now a delay of 233 clock ticks

          ...

          ...

          Thread 0 and now a delay of 225 clock ticks

          Thread 1 and now a delay of 226 clock ticks

          ...

          ...

          Thread 1 and now a delay of 238 clock ticks

        

I think the result should be:

         

          Entering twothreads' cyg_user_start() function

          Thread 0 and now a delay of 233 clock ticks

          ...

          Thread 1 and now a delay of 226 clock ticks

          ...

          Thread 0 and now a delay of 233 clock tick

          ...

          Thread 1 and now a delay of 238 clock ticks

          ...

    

         

          I didn't change anything in the configuration from the default .

          Last I don't express clearly.I'm very sorry.

          Thank you very much!