TVirtualMutex

    public:

                     virtual ~TVirtualMutex()
                       Int_t Acquire()
              static TClass* Class()
               virtual Int_t CleanUp()
      virtual TVirtualMutex* Factory(Bool_t = kFALSE)
             virtual TClass* IsA() const
               virtual Int_t Lock()
              TVirtualMutex& operator=(const TVirtualMutex&)
                       Int_t Release()
                virtual void ShowMembers(TMemberInspector& insp, char* parent)
                virtual void Streamer(TBuffer& b)
                        void StreamerNVirtual(TBuffer& b)
               virtual Int_t TryLock()
               virtual Int_t UnLock()

Class Description

                                                                      
 TVirtualMutex                                                        
                                                                      
 This class implements a mutex interface. The actual work is done via 
 TMutex which is available as soon as the thread library is loaded.   
                                                                      
 and                                                                  
                                                                      
 TLockGuard                                                           
                                                                      
 This class provides mutex resource management in a guaranteed and    
 exception safe way. Use like this:                                   
 {                                                                    
    TLockGuard guard(mutex);                                          
    ... // do something                                               
 }                                                                    
 when guard goes out of scope the mutex is unlocked in the TLockGuard 
 destructor. The exception mechanism takes care of calling the dtors  
 of local objects so it is exception safe.