From e399e10607bdc40a7ade1d4df6b10116fded7daa Mon Sep 17 00:00:00 2001
From: scrawl <scrawl@baseoftrash.de>
Date: Wed, 1 Feb 2017 03:06:59 +0100
Subject: [PATCH] Add missing lock in shareMaterial

---
 components/nifosg/nifloader.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/components/nifosg/nifloader.cpp b/components/nifosg/nifloader.cpp
index 66575699f6..c758e87364 100644
--- a/components/nifosg/nifloader.cpp
+++ b/components/nifosg/nifloader.cpp
@@ -1643,10 +1643,12 @@ namespace NifOsg
         osg::Material* shareMaterial(osg::Material* mat)
         {
             typedef std::set<osg::ref_ptr<osg::Material>, CompareMaterial> MatCache;
-            static MatCache mats;
-            MatCache::iterator found = mats.find(mat);
-            if (found == mats.end())
-                found = mats.insert(mat).first;
+            static MatCache sMats;
+            static OpenThreads::Mutex sMutex;
+            OpenThreads::ScopedLock<OpenThreads::Mutex> lock(sMutex);
+            MatCache::iterator found = sMats.find(mat);
+            if (found == sMats.end())
+                found = sMats.insert(mat).first;
             return *found;
         }