--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Applications/Resources/Graveyard/Threading/SharedValue.h	Thu Oct 22 16:17:10 2020 +0200
@@ -0,0 +1,58 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2020 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include <boost/noncopyable.hpp>
+#include <boost/thread/mutex.hpp>
+
+namespace OrthancStone
+{
+  // A value that is protected by a mutex, in order to be shared by
+  // multiple threads
+  template <typename T>
+  class SharedValue : public boost::noncopyable
+  {
+  private:
+    boost::mutex   mutex_;
+    T              value_;
+    
+  public:
+    class Locker : public boost::noncopyable
+    {
+    private:
+      boost::mutex::scoped_lock  lock_;
+      T&                         value_;
+
+    public:
+      Locker(SharedValue& shared) :
+        lock_(shared.mutex_),
+        value_(shared.value_)
+      {
+      }
+
+      T& GetValue() const
+      {
+        return value_;
+      }
+    };
+  };
+}