added partial VFS support - enough to read static data from any source

ExternalLibs/ttvfs/VFSAtomic.h

@@ -0,0 +1,39 @@
+// VFSAtomic.h - atomic operations and thread locking
+// For conditions of distribution and use, see copyright notice in VFS.h
+
+#ifndef VFS_ATOMIC_H
+#define VFS_ATOMIC_H
+
+#include "VFSDefines.h"
+
+VFS_NAMESPACE_START
+
+int Atomic_Incr(volatile int &i);
+int Atomic_Decr(volatile int &i);
+
+// generic Mutex class, needs to be reentrant/recursive.
+class Mutex
+{
+public:
+    Mutex();
+    ~Mutex();
+    void Lock();
+    void Unlock();
+
+protected:
+    // add own stuff if needed
+};
+
+class Guard
+{
+public:
+    Guard(Mutex& m);
+    ~Guard();
+
+protected:
+    Mutex& _m;
+};
+
+VFS_NAMESPACE_END
+
+#endif