wefts_rmutex.h

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/*
   wefts_rmutex.h
   Reentrant Mutex object header file.

   $Id: wefts_rmutex.h,v 1.8 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_RMUTEX_H
#define WT_RMUTEX_H

#include <wefts_mutex.h>

namespace Wefts {

class RMutex: public Mutex {
private:
   OSThread m_owner;
   volatile int m_lockCount;

public:
   RMutex(): Mutex() { m_lockCount = 0;}

   virtual inline void lock()
   {
      if ( m_owner.same() ) m_lockCount++;
      else {
         Mutex::lock();
         m_owner.setCurrent();
         m_lockCount = 1;
      }
   }
   
   virtual inline bool trylock() 
   {
      if ( m_owner.same() ) {
         m_lockCount++;
         return true;
      }
      else {
         if ( Mutex::trylock() ) {
            m_owner.setCurrent();
            m_lockCount = 1;
            return true;
         }
      }
      return false;
   }

   virtual inline void unlock()
   {
      if ( m_owner.same() ) {
         m_lockCount--;
         if ( ! m_lockCount ) {
            m_owner.invalidate();
            Mutex::unlock();
         }
      }
   }
};

}
#endif
/* end of wefts_rmutex.h */

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