wefts_rwmutex.h

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/*
   wefts_rwmutex.h
   Read/write Non Reentrant Mutex object header file.

   $Id: wefts_rwmutex.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_RWMUTEX_H
#define WT_RWMUTEX_H

#include <wefts_cleanup.h>
#include <wefts_mutex.h>
#include <wefts_cond.h>
#include <wefts_error.h>

#ifndef NO_ASSERTION
#include <cassert>
#endif

namespace Wefts {

class RWMutex: public CleanupHandler
{
protected:
   Mutex  m_mutex;
   Condition m_condRead;
   Condition m_condWrite;

   int m_locking;
   int m_waitingRead;
   int m_waitingWrite;
   int m_promoting;

public:
   RWMutex();

   virtual bool lockRead( double time = 0.0 );

   virtual bool tryLockRead();


   virtual bool lockWrite( double time =0.0 );

   virtual bool tryLockWrite();


   virtual bool promote( double time = 0.0 ) throw( InvalidError );

   virtual bool tryPromote();


   void degrade() throw( InvalidError );

   virtual void unlock() throw ( InvalidError );

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

}

#endif
/* end of wefts_rwmutex.h */

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