From d17fe4b039de8e1dca65c1422e009690346cc7e3 Mon Sep 17 00:00:00 2001
From: lukeIam <2lukeiam@gmail.com>
Date: Sat, 19 Dec 2015 16:58:08 +0100
Subject: [PATCH] Fix: access to _AcInstanceLocks was not threadsafe

---
 Vocaluxe/Lib/Video/Acinerella/CAcinerella.cs | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/Vocaluxe/Lib/Video/Acinerella/CAcinerella.cs b/Vocaluxe/Lib/Video/Acinerella/CAcinerella.cs
index 08d908c3..91d4e4e1 100644
--- a/Vocaluxe/Lib/Video/Acinerella/CAcinerella.cs
+++ b/Vocaluxe/Lib/Video/Acinerella/CAcinerella.cs
@@ -192,17 +192,23 @@ namespace Vocaluxe.Lib.Video.Acinerella
 #endif
 
         private static readonly Object _Lock = new Object();
+        private static readonly Object _DictionaryLock = new Object();
         private static readonly Dictionary<Int64, object> _AcInstanceLocks = new Dictionary<Int64, object>(20);
 
         private static object _GetLockToken(IntPtr pAcDecoder)
         {
-            object l = null;
-            _AcInstanceLocks.TryGetValue(pAcDecoder.ToInt64(), out l);
-            if (l == null)
+            object l;
+
+            lock (_DictionaryLock)
             {
-                l = new object();
-                _AcInstanceLocks.Add(pAcDecoder.ToInt64(), l);
+                _AcInstanceLocks.TryGetValue(pAcDecoder.ToInt64(), out l);
+                if (l == null)
+                {
+                    l = new object();
+                    _AcInstanceLocks.Add(pAcDecoder.ToInt64(), l);
+                }
             }
+           
             return l;
         }