wefts_critical.h

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/*
   wefts_critical.h
   Execution barrier for wefts.

   $Id: wefts_critical.h,v 1.4 2004/04/05 12:42:06 jonnymind Exp $
---------------------------------------------
   Begin      : Wed, 10 Mar 2004 16:31:37 +0100
   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_CRITICAL_SECTION_H
#define WT_CRITICAL_SECTION_H

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

namespace Wefts
{

class CriticalSection: public CleanupHandler
{
   int m_signedIn;
   
   int m_signRequests;
   
   int m_enterRequests;
   
   int m_fenceCount; 

   bool m_achieved;
   
   Mutex m_mutex;
   
   Condition m_signinCond;
   
   Condition m_enterCond;

public:
   CriticalSection();
   
   bool enter( bool fence=true, bool timed=false, double time = 0 );   
   
   bool enter( double time, bool fence=true) { return enter( fence, true, time ); }
   
   bool tryEnter();
   
   void leave();
   
   void signIn();
   
   void signOut();
   
   void checkPoint();
   
   virtual void handleCleanup( int code, void *caller=0 );
};

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

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