[GRASS-SVN] r57962 - grass/trunk/raster/r.mapcalc

[svn_grass at osgeo.org]

Author: huhabla
Date: 2013-10-09 00:47:11 -0700 (Wed, 09 Oct 2013)
New Revision: 57962

Modified:
   grass/trunk/raster/r.mapcalc/map3.c
Log:
Fix for ticket #2074 as usggested by Glynn

Modified: grass/trunk/raster/r.mapcalc/map3.c
===================================================================
--- grass/trunk/raster/r.mapcalc/map3.c	2013-10-09 07:40:05 UTC (rev 57961)
+++ grass/trunk/raster/r.mapcalc/map3.c	2013-10-09 07:47:11 UTC (rev 57962)
@@ -521,6 +521,12 @@
 {
     int i;
 
+    /* We need to reduce the number of worker threads to one, to
+     * avoid that several threads access a single map for reading
+     * at the same time. The raster3d library is not thread safe.
+     * */
+    putenv("WORKERS=1");
+
     for (i = 0; i < num_maps; i++)
 	setup_map(&maps[i]);
 }