Dear all, I recently found some time to hunt for that stupid attribute table bug in the MingW compiled version of GRASS 6.3.CVS. This is the setup I used:
Windows 2000 SP4 QGIS 0.8.1 GDAL 1.4.1 GRASS 6.3.CVS June 18th 2007 MSYS 1.0.10 MingW 5.1.3 GNU Debug for MingW 6.3.1 The problem, as I described earlier: under native Win32 (MingW binaries), GRASS modules that access attribute data in a vector map frequently deadlock, i.e. they will just sleep and operations never finish. It's easy to verify this using the following dataset: ftp://ftp.rz.uni-kiel.de/pub/ufg/qgis-test.zip and this command line: v.out.ogr.exe [EMAIL PROTECTED] type=point layer=1 format=ESRI_Shapefile -c dsn=. olayer=test After a while, v.out.ogr.exe will fall asleep, with 0% CPU usage. In fact, out of 50 tries I made, only 3 resulted in a successful export! The exact point at which v.out.ogr.exe deadlocks cannot be predicted. The problem appears randomly. In most instances, when killing the process, a "dbmi: Protocol error" will pop up. Like Moritz did earlier, I tried debugging v.out.ogr.exe and dbf.exe using GDB 6.3.1. And like him, I did not get very far because of missing symbol information in the Windows binaries (I am just not much of a Windows developer). However, I suspect that the problem is NOT IN THE DBF DRIVER. Here is why: I added sqlite support to the Win binaries and made a copy of the sample vector map 'dgm' contained in qgis-test.zip. Before I did this, I switched to the sqlite database driver, so the attribute data ended up in an sqlite file instead of a DBF. I verified that this was indeed the case. I then ran the command line above on the vector map connected to the sqlite table and ran into the same problems! As far as I can tell, the bug must be in a higher layer of the DBMI lib, perhaps DBMI client or base? Side note: I ran the same command with GRASS CVS sources from the same day under Linux. I used Valgrind to detect any memory handling problems but found nothing! If any of you have more experience debugging Win32 binaries, please post your hints. I am running out of ideas here ... Best, Benjamin -- Benjamin Ducke, M.A. Archäoinformatik (Archaeoinformation Science) Institut für Ur- und Frühgeschichte (Inst. of Prehistoric and Historic Archaeology) Christian-Albrechts-Universität zu Kiel Johanna-Mestorf-Straße 2-6 D 24098 Kiel Germany Tel.: ++49 (0)431 880-3378 / -3379 Fax : ++49 (0)431 880-7300 www.uni-kiel.de/ufg _______________________________________________ grass-dev mailing list [email protected] http://grass.itc.it/mailman/listinfo/grass-dev
