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+/*
+ 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