pageframe.h

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/*
 *  Copyright (C) 2004,2005 Bregmasoft
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef ZYGOMA_PAGEFRAME_H_ 
#define ZYGOMA_PAGEFRAME_H_ 

#include "config.h"

namespace Zygoma
{
  class PageFrame
  {
  public:

    PageFrame()
    : m_owningTaskId(0)
    , m_isLocked(false)
    , m_isInvalid(false)
    , m_stats(0)
    { }

    ~PageFrame()
    { }

    unsigned int
    owningTaskId() const
    { return m_owningTaskId; }

    void
    setOwningTaskId(unsigned int taskId)
    { m_owningTaskId = taskId; }

    bool
    isLocked() const
    { return m_isLocked; }

    void
    lock()
    { m_isLocked = true; }

    void
    unlock()
    { m_isLocked = false; }

    bool
    isValid() const
    { return m_isInvalid == false; }
    
    void
    invalidate()
    { m_isInvalid = true; }

  private:
    PageFrame(const PageFrame&);
    PageFrame& operator=(const PageFrame&);

  private:
    unsigned int m_owningTaskId: 14;
    bool         m_isLocked:      1;
    bool         m_isInvalid:     1;
    unsigned int m_stats:        16;
  } ZYGOMA_PACKED;
} // namespace Zygoma

#endif // ZYGOMA_PAGEFRAME_H_ 

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