Re: [ECOS] problem thread creation

[Gary Thomas <gary at mlbassoc dot com>]

On Wed, 2004-09-15 at 06:12, Aravind B wrote:
> 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)

I'm glad your problem is solved.  However, since you've asked for
our help (gladly provided), how about sharing what you did wrong
so that the next person to run afoul of this can find the answer
in the archives?  It only seems fair...

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


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