Add original TrueCrypt 7.1a sources

src/Platform/SharedVal.h

@@ -0,0 +1,71 @@
+/*
+ Copyright (c) 2008 TrueCrypt Developers Association. All rights reserved.
+
+ Governed by the TrueCrypt License 3.0 the full text of which is contained in
+ the file License.txt included in TrueCrypt binary and source code distribution
+ packages.
+*/
+
+#ifndef TC_HEADER_Platform_SharedVal
+#define TC_HEADER_Platform_SharedVal
+
+#include "PlatformBase.h"
+#include "Mutex.h"
+
+namespace TrueCrypt
+{
+	template <class T>
+	class SharedVal
+	{
+	public:
+		SharedVal () { }
+		explicit SharedVal (T value) : Value (value) { }
+		virtual ~SharedVal () { }
+
+		operator T ()
+		{
+			return Get ();
+		}
+
+		T Decrement ()
+		{
+			ValMutex.Lock();
+			T r = --Value;
+			ValMutex.Unlock();
+			return r;
+		}
+
+		T Get ()
+		{
+			ValMutex.Lock();
+			T r = Value;
+			ValMutex.Unlock();
+			return r;
+		}
+
+		T Increment ()
+		{
+			ValMutex.Lock();
+			T r = ++Value;
+			ValMutex.Unlock();
+			return r;
+		}
+
+		void Set (T value)
+		{
+			ValMutex.Lock();
+			Value = value;
+			ValMutex.Unlock();
+		}
+
+	protected:
+		volatile T Value;
+		Mutex ValMutex;
+
+	private:
+		SharedVal (const SharedVal &);
+		SharedVal &operator= (const SharedVal &);
+	};
+}
+
+#endif // TC_HEADER_Platform_SharedVal