wefts_barrier.h

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/*
   wefts_barrier.h
   Execution barrier for wefts.

   $Id: wefts_barrier.h,v 1.4 2004/03/28 21:45:40 jonnymind Exp $
---------------------------------------------
   Begin      : 2003-08-03 17:50
   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_BARRIER_H
#define WT_BARRIER_H

#include <wefts_fastcond.h>


namespace Wefts {

class Barrier {
private:
   volatile unsigned int m_treshold;
   volatile unsigned int m_subscribed;
   FastCondition m_cond;   // should be auto-magically initialized and removed
   volatile bool m_release;
   volatile bool m_open;

public:
   Barrier( unsigned int treshold=0, bool open = false );

   void wait();

   inline unsigned int waiting() { return m_subscribed; }

   inline unsigned int treshold() { return m_treshold; }

   inline bool blocking() { return !m_open; }

   void treshold( unsigned int th );

   void release();

   void open();

   void close();

};

}

#endif
/* end of wefts_barrier.h */

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