[ECOS] about timeslice and same priority thread switch.

[yyl]

 
----- 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!
 
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