From f733ef5f6b846248b5581f30db117d52ec173890 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Fri, 15 Nov 2013 03:07:01 +0100
Subject: [PATCH] Handle non-thread-safe Math::Geometry::Voronoi. #1527

---
 lib/Slic3r/ExPolygon.pm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/Slic3r/ExPolygon.pm b/lib/Slic3r/ExPolygon.pm
index 3e8d91713..b72b93542 100644
--- a/lib/Slic3r/ExPolygon.pm
+++ b/lib/Slic3r/ExPolygon.pm
@@ -170,9 +170,13 @@ sub _medial_axis_clip {
     return @result;
 }
 
+my $voronoi_lock :shared;
+
 sub _medial_axis_voronoi {
     my ($self, $width) = @_;
     
+    lock($voronoi_lock);
+    
     my $voronoi;
     {
         my @points = ();