#ifndef ROOT_TRWLock
#define ROOT_TRWLock

//+SEQ,CopyRight,T=NOINCLUDE.

//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TRWLock                                                              //
//                                                                      //
// This class implements a reader/writer lock. A rwlock allows          //
// a resource to be accessed by multiple reader threads but only        //
// one writer thread.                                                   //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#ifndef ROOT_TObject
//*KEEP,TObject.
#include "TObject.h"
//*KEND.
#endif
#ifndef ROOT_TMutex
//*KEEP,TMutex,T=C++.
#include "TMutex.h"
//*KEND.
#endif
#ifndef ROOT_TCondition
//*KEEP,TCondition,T=C++.
#include "TCondition.h"
//*KEND.
#endif


class TRWLock : public TObject {

private:
   Int_t        fReaders;
   Int_t        fWriters;
   TMutex       fMutex;
   TCondition   fLockFree;

public:
   TRWLock();
   virtual ~TRWLock() { }

   Int_t  ReadLock();
   Int_t  ReadUnLock();
   Int_t  WriteLock();
   Int_t  WriteUnLock();

   ClassDef(TRWLock,0)  // Reader/writer lock
};

#endif