From fca3e47954fe36687989328ac90cbc6747e4bc4e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Caol=C3=A1n=20McNamara?= <caolanm@redhat.com>
Date: Mon, 14 Mar 2011 10:20:12 +0000
Subject: [PATCH] Related: rhbz#684477 make sure this is thread safe

---
 basegfx/source/polygon/b2dpolygontools.cxx |   36 +++++++++++++++++----------
 1 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/basegfx/source/polygon/b2dpolygontools.cxx b/basegfx/source/polygon/b2dpolygontools.cxx
index 1967e6e..3271314 100644
--- a/basegfx/source/polygon/b2dpolygontools.cxx
+++ b/basegfx/source/polygon/b2dpolygontools.cxx
@@ -32,6 +32,7 @@
 #include <basegfx/polygon/b2dpolygontools.hxx>
 #include <osl/diagnose.h>
 #include <rtl/math.hxx>
+#include <rtl/instance.hxx>
 #include <basegfx/polygon/b2dpolygon.hxx>
 #include <basegfx/polygon/b2dpolypolygon.hxx>
 #include <basegfx/range/b2drange.hxx>
@@ -1836,22 +1837,31 @@ namespace basegfx
             return aRetval;
         }
 
-        B2DPolygon createUnitPolygon()
+        namespace
         {
-            static B2DPolygon aRetval;
-
-            if(!aRetval.count())
+            struct theUnitPolygon :
+                public rtl::StaticWithInit<B2DPolygon, theUnitPolygon>
             {
-                aRetval.append( B2DPoint( 0.0, 0.0 ) );
-                aRetval.append( B2DPoint( 1.0, 0.0 ) );
-                aRetval.append( B2DPoint( 1.0, 1.0 ) );
-                aRetval.append( B2DPoint( 0.0, 1.0 ) );
+                B2DPolygon operator () ()
+                {
+                    B2DPolygon aRetval;
 
-                // close
-                aRetval.setClosed( true );
-            }
-            
-            return aRetval;
+                    aRetval.append( B2DPoint( 0.0, 0.0 ) );
+                    aRetval.append( B2DPoint( 1.0, 0.0 ) );
+                    aRetval.append( B2DPoint( 1.0, 1.0 ) );
+                    aRetval.append( B2DPoint( 0.0, 1.0 ) );
+
+                    // close
+                    aRetval.setClosed( true );
+
+                    return aRetval;
+                }
+            };
+        }
+
+        B2DPolygon createUnitPolygon()
+        {
+            return theUnitPolygon::get();
         }
 
         B2DPolygon createPolygonFromCircle( const B2DPoint& rCenter, double fRadius )
-- 
1.7.4.1