mallocfreespace.c

[Kate Feng]

Till Straumann wrote:

> Kate Feng wrote:
> > Is it better to return 0 instead of -1 if there is no free space in the
> > heap ?
> >
> >
> AFAIK, a return value of -1 indicates an internal error
> (corrupted heap, illegal region id etc.) whereas 0 indicates that no
> free space is available.
>
> I'm not sure it's a good idea to mingle these together.
> (-1) can tell you that something's really really messed up...

It's true.  Thus, it might be a good idea to printk(" ") the error message
when REMS is really messed up.

Kate

>
>
> IMHO, EPICS should check for that case and alert the user.
>
> -- T.
> > --- mallocfreespace.c.orig Mon Nov 29 17:45:43 2004
> > +++ mallocfreespace.c Thu May 24 13:57:24 2007
> > @@ -40,5 +40,5 @@
> >    if ( !rtems_region_get_free_information( RTEMS_Malloc_Heap,
> > &heap_info ) ) {
> >      return (size_t) heap_info.Free.largest;
> >    }
> > -  return (size_t) -1;
> > +  return (size_t) 0;
> >  }
> >
> > Returning -1 broke the following code in EPICS :
> >
> > return (malloc_free_space() > 100000 + contiguousBlockSize);
> >
> > Perhaps,
> > return ( ((int) malloc_free_space() )> 100000 + contiguousBlockSize);
> >
> > would be fine, but I thought it's better to return 0 if there is no
> > free space in the heap.  What do you think ?
> >
> > Kate
> >
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> >