From 86859c46451a0488c37513a722ef21a5e8dd4433 Mon Sep 17 00:00:00 2001
From: Matthias Hochsteger <matthias.hochsteger@tuwien.ac.at>
Date: Tue, 3 May 2016 14:59:08 +0200
Subject: [PATCH] fix bug which caused a mutex to unlock twice

---
 libsrc/visualization/vssolution.cpp | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/libsrc/visualization/vssolution.cpp b/libsrc/visualization/vssolution.cpp
index 8a79a430..8b7371bb 100644
--- a/libsrc/visualization/vssolution.cpp
+++ b/libsrc/visualization/vssolution.cpp
@@ -837,13 +837,9 @@ namespace netgen
         //      cout << "clipsolution = " << clipsolution << endl;
         if (vispar.clipping.enable && clipsolution == 2)      
           {
-            // lock->UnLock();
-            NgLock mlock (mesh->Mutex(), 0);
-            mlock.UnLock(); 
+            mesh->Mutex().unlock();
             mesh->BuildElementSearchTree();
-            mlock.Lock();
-
-            // lock->Lock();
+            mesh->Mutex().lock();
           }