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[nsoonhui <>]

From my code, it doesn't seem so. But I have not have the time to reproduce a
sample for this.

A comment
<https://sourceforge.net/p/flightgear/terragear/ci/86aa9261ca6b38bf14257ae45fc7c6c1120d17d2/tree/src/Lib/terragear/mesh/tg_mesh_arrangement_cleaning.cxx?diff=b740168613e5fbfa8fe7565429d06ceba30a54af>
  
on the internet seems to agree with me:

+    // snap rounding notes:
+    // 1) doesn't appear to be threadsafe
+    // 2) no way to define the origin of snapping.  so if a point is at
0,0, and pixel size is 1, new point will be at 0.5, 0.5.
+    //    We don't want this, so we translate the entire dataset back by
1/2 pixel size so 0,0 is still 0,0
+    
+    lock->lock();
+    CGAL::snap_rounding_2<srTraits, srSegmentList::const_iterator,
srPolylineList>
+    (srInput.begin(), srInput.end(), srOutput, 0.0000002, true, false, 5);
+    lock->unlock();

Is it possible that you make this operation thread safe?



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