From c3ac74d4de09b362b213d3da71b476f41802feab Mon Sep 17 00:00:00 2001
From: Andreas Fabri <andreas.fabri@geometryfactory.com>
Date: Wed, 31 Aug 2016 14:05:22 +0200
Subject: [PATCH] Make variables thread local

---
 Snap_rounding_2/include/CGAL/Snap_rounding_2.h | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/Snap_rounding_2/include/CGAL/Snap_rounding_2.h b/Snap_rounding_2/include/CGAL/Snap_rounding_2.h
index 5bbac9affdf..2e65abe672e 100644
--- a/Snap_rounding_2/include/CGAL/Snap_rounding_2.h
+++ b/Snap_rounding_2/include/CGAL/Snap_rounding_2.h
@@ -32,6 +32,7 @@
 #include <CGAL/utility.h>
 #include <CGAL/Iterator_project.h>
 #include <CGAL/function_objects.h>
+#include <CGAL/tss.h>
 
 namespace CGAL {
 
@@ -87,7 +88,14 @@ private:
   Segment_2 *left_seg;
   Segment_2 *top_seg;
   Segment_2 *bot_seg;
-  static SEG_Direction seg_dir;
+
+  static SEG_DIR& direction()
+  {
+    CGAL_STATIC_THREAD_LOCAL_VARIABLE(SEG_Direction, seg_dir,SEG_UP);
+    return seg_dir;
+  }
+
+
 
 public:
   Hot_pixel(const Point_2 & inp_point, NT inp_pixel_size);
@@ -99,12 +107,12 @@ public:
   bool intersect_bot(const Segment_2 & seg, SEG_Direction seg_dir) const;
   bool intersect_top(const Segment_2 & seg, SEG_Direction seg_dir) const;
   bool intersect(Segment_data & seg, SEG_Direction seg_dir) const;
-  void set_direction(SEG_Direction inp_seg_dir) { seg_dir = inp_seg_dir; }
-  SEG_Direction get_direction() const { return(seg_dir); }
+  void set_direction(SEG_Direction inp_seg_dir) { direction() = inp_seg_dir; }
+  SEG_Direction get_direction() const { return direction(); }
 };
 
 /*! */
-template<class Traits_> SEG_Direction Hot_pixel<Traits_>::seg_dir;
+//template<class Traits_> SEG_Direction Hot_pixel<Traits_>::seg_dir;
 
 // a function for compare two hot pixels for the set of hot pixels
 template<class Traits_>