Object name recycling problem

Joel Sherrill joel.sherrill at OARcorp.com
Mon Mar 3 14:38:35 UTC 2003

Nigel Spon wrote:
> Hi,
> I seem to have run across a problem with the way object names are
> allocated in RTEMS. I have found that a crash I was getting after
> making and deleting several tasks was due to the "name" field of the
> "Objects_control" structure returned by _Objects_Allocate being nil.
> This turns out to be because deleted objects are recycled into the
> Inactive chain of the objects_information block, but if _Objects_Close
> has been called on them the "name" fields of the freed objects have
> been set to nil. When _Objects_Allocate gets around to reallocating a
> previously Closed object, Objects_Open calls _Objects_Copy_Name_Raw
> with a nil destination pointer... and dies for writing to NIL.
> Is this a known problem? (I am using a June 2002 snapshot, but the same
> code seems to be in the Feb 2003 snapshot) I can't see what I might be
> doing wrong that would cause this behaviour but if this is my fault
> somehow I would really like to know...

It doesn't match any known problems.

Can you produce a small test application that does this?  Given a simple
test application, if it is a problem, it should be easy to fix and we
want to get it fixed.

> ---
> “Some will say that they were at one time troubled in sleeping but have
> “recovered” from it, as though awareness were a disease, as perhaps it
> is.”
> Nigel Spon
> ADInstruments Ltd, Dunedin, NZ

Joel Sherrill, Ph.D.             Director of Research & Development
joel at OARcorp.com                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
Support Available                (256) 722-9985

More information about the users mailing list