Fix a crash related to concurrent access to config file by different threads.

--HG--
branch : trunk

src/server/shared/Configuration/Config.cpp

@@ -26,6 +26,8 @@ static bool GetValueHelper(ACE_Configuration_Heap *mConf, const char *name, ACE_
     if (!mConf)
         return false;
 
+    ACE_GUARD_RETURN(ACE_Thread_Mutex, guard, sConfig.mMtx, false);
+
     ACE_TString section_name;
     ACE_Configuration_Section_Key section_key;
     ACE_Configuration_Section_Key root_key = mConf->root_section();

src/server/shared/Configuration/Config.h

@@ -43,6 +43,9 @@ class Config
         float GetFloatDefault(const char * name, const float def);
 
         std::string GetFilename() const { return mFilename; }
+
+        ACE_Thread_Mutex mMtx;
+
     private:
         std::string mFilename;
         ACE_Configuration_Heap *mConf;