[GRASS-dev] R: [GRASS-windows] WinGRASS: Test Build on Vista

[Benjamin Ducke]

Actually, r.los seems to have faulty mem management on all platforms.
If I valgrind the module, I get:

==20182==    at 0x804AB15: hidden_point_elimination (pts_elim.c:105)
==20182==    by 0x8049D74: main (main.c:303)
==20182==  Address 0x4691CB8 is 24 bytes inside a block of size 32 free'd
==20182==    at 0x402237F: free (vg_replace_malloc.c:233)
==20182==    by 0x403767C: G_free (alloc.c:126)
==20182==    by 0x8049673: delete (delete.c:39)
==20182==    by 0x804AB14: hidden_point_elimination (pts_elim.c:189)
==20182==    by 0x8049D74: main (main.c:303)
  100%
==20182==
==20182== Conditional jump or move depends on uninitialised value(s)
==20182==    at 0x40A6CB2: (within /usr/lib/libz.so.1.2.3.3)
==20182==    by 0x40A7E5F: deflate (in /usr/lib/libz.so.1.2.3.3)
==20182==    by 0x40463A7: G_zlib_compress (flate.c:359)
==20182==    by 0x4046551: G_zlib_write (flate.c:224)
==20182==    by 0x405D54F: G__write_data_compressed (put_row.c:337)
==20182==    by 0x405DE89: put_raster_row (put_row.c:477)
==20182==    by 0x804A007: main (main.c:351)
==20182==

... and a dozen more like that. Not a good sign really.

My guess is that whether r.los crashes or not is simply due to
how relaxed the OS's memory allocation scheme is. Some systems
are more forgiving for the sake of better performance. I guess
that XP is more on the strict side and thus kills the module,
while Linux and Vista let you get away with it.

Fixing the mem allocation errors reported by Valgrind may very
well stop r.los from crashing on Win32.

Ben


marco.pasetti at alice.it wrote:
> Hi,
> 
>  >I have installed WinGRASS-6.3.0-4 in my Windows XP profesional x64 and all
>  >was fine,
> 
> Many thanks for your help. I'm happy that the Vista build works fine 
> also on XP (as I actually expected).
> 
>  >but it does not solve the
>  >http://trac.osgeo.org/grass/ticket/111bug. When I try to execute the
>  >following operation Windows reports me a
>  >system failure:
> 
>  >r.los input=elevation.dem output=los coordinate=599505,4921010  
> max_dis=2525
> 
> Actually I don't know why r.los has problems on XP, because on Vista it 
> works fine.
> Only our IT Guru Glynn might solve the question... :-)
> 
> Many thanks,
> 
> Marco
> 
> 
> 
> 
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> grass-dev mailing list
> grass-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-dev


-- 
Benjamin Ducke
Senior Applications Support and Development Officer

Oxford Archaeological Unit Limited
Janus House
Osney Mead
OX2 0ES
Oxford, U.K.

Tel: +44 (0)1865 263 800 (switchboard)
Tel: +44 (0)1865 980 758 (direct)
Fax :+44 (0)1865 793 496
benjamin.ducke at oxfordarch.co.uk




------
Files attached to this email may be in ISO 26300 format (OASIS Open Document Format). If you have difficulty opening them, please visit http://iso26300.info for more information.