FireMonkey equivalent of VCL TCriticalSection

I have several VCL classes that I have developed that allow me to create a software state machine running in it's own thread. I now want to use this code in an Android App. But I can't find the FireMonkey equivalent of a VCL TCriticalSection. In particular I have a header for a thread lock wrapper class that compiles fine under VCL but gives an error E2303 "Type Name Expected" at the line *TCritical Section TheLock when I try to compile it using FMX

The complete header file contents is:

//---------------------------------------------------------------------------

class TThreadSafeLock

{

private:

   TCriticalSection *TheLock;

public:

   void ClearLock(void);

   void SetLock(void);   // will hold up processing until the Lock is achieved

   TThreadSafeLock(void);

   ~TThreadSafeLock();

};

Is there a header file that I need to include that defines TCriticalSection for FireMonkey - or does FireMonkey have a different name for an identical class?