wefts_rrwmutex.h

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/*
   wefts_rrwmutex.h
   Read/write Reentrant/advanced Mutex object header file.

   $Id: wefts_rrwmutex.h,v 1.10 2004/03/28 21:45:40 jonnymind Exp $
---------------------------------------------
   Begin      : 2003-08-02 20:58
   Author     : Giancarlo Niccolai

   Last modified because:

*/

/**************************************************************************
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU Library General Public License as       *
*   published by the Free Software Foundation; either version 2.1 of the  *
*   License, or (at your option) any later version.                       *
***************************************************************************/


#ifndef WT_RRWMUTEX_H
#define WT_RRWMUTEX_H

#include <wefts_rwmutex.h>
#ifndef NO_ASSERTIONS
#include <cassert>
#endif

namespace Wefts {

class RRWMutex: public RWMutex  {
private:
   int m_fence;
   OSThread m_owner;

public:
   RRWMutex(): RWMutex() {
      m_fence = 0;
   }

   virtual bool lockRead( double seconds=0.0 );
   
   virtual bool tryLockRead();

   virtual bool promoteFence( double time = 0.0, bool fence=true )
            throw( InvalidError );

   virtual bool promote( double time = 0.0 )  throw( InvalidError )
   {
      return promoteFence( time, false );
   }
     
  
   virtual bool lockWriteFence( double time =0.0, bool fence = true);

   virtual bool lockWrite( double seconds=0.0 ) { 
      return lockWriteFence( seconds, false );
   }
   

   void degrade() throw( InvalidError );
   
   virtual void unlock() throw( InvalidError );

   virtual void handleCleanup( int code, void *caller = 0 );
};

}

#endif
/* end of wefts_rrwmutex.h */

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