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problem thread creation



On Wed, 2004-09-15 at 04:39, Andrew Lunn wrote:
> On Wed, Sep 15, 2004 at 03:26:12PM +0530, Aravind B wrote:
> > 
> > 
> > > Thanks for ur kind reply
> > > After debugging i found that problem is in following code fragment
in
> > > file thread.cxx:
> > > 
> > >               Cyg_Thread::add_to_list( void )
> > > -     127     {
> > >       128         // Add thread to housekeeping list
> > >       129         Cyg_Scheduler::lock();
> > >       130     
> > > -     131         if( thread_list == 0 )
> > >       132             list_next = this;
> > >       133         else {prev != thread_list
> > >       134             Cyg_Thread *prev = thread_list;
> > > -     135             do {
> > > -     136                 if ( this == prev )
> > >       137                     break; // found it already!
> > > -     138                 prev = prev->list_next;
> > > -     139             } while ( prev != thread_list );
> > > -     140             if ( this != prev ) {
> > >       141                 // insert it in the list:
> > > -     142                 list_next = thread_list->list_next;
> > > -     143                 thread_list->list_next = this;
> > >       144             }
> > >       145         }
> > > 
> > > the control is in the while loop forever as prev == thread_list (
line
> > > 139 )ie prev has become NULL.
> > 
> > >Sounds like your stack is too small and you are overwriting the
thread
> > >structures.
> > > Andrew
> > But my stack size is 4096 bytes.
> 
> How do you know that is big enough?

>Also, how are your stacks declared?  Looking at what you sent
>yesterday,you created one thread with its stack stack[0] and the other
>threadwith its stack stack[1].  This looks possibly wrong to me.
>Did you run the code with asserts enabled?  (CYGPKG_INFRA_DEBUG on)

>-- 
>Gary Thomas <gary@mlbassoc.com>
>MLB Associates

thanks for the solution.
this  has solved my problem. (The problem was with the stack
declaration)

regards
Aravind B



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