SystemBase.h

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/****************** <VPR heading BEGIN do not edit this line> *****************
 *
 * VR Juggler Portable Runtime
 *
 * Original Authors:
 *   Allen Bierbaum, Patrick Hartling, Kevin Meinert, Carolina Cruz-Neira
 *
 * -----------------------------------------------------------------
 * File:          $RCSfile$
 * Date modified: $Date: 2005-06-15 09:11:46 -0500 (Wed, 15 Jun 2005) $
 * Version:       $Revision: 17686 $
 * -----------------------------------------------------------------
 *
 ****************** <VPR heading END do not edit this line> ******************/

/*************** <auto-copyright.pl BEGIN do not edit this line> **************
 *
 * VR Juggler is (C) Copyright 1998-2005 by Iowa State University
 *
 * Original Authors:
 *   Allen Bierbaum, Christopher Just,
 *   Patrick Hartling, Kevin Meinert,
 *   Carolina Cruz-Neira, Albert Baker
 *
 * This library 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 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 *************** <auto-copyright.pl END do not edit this line> ***************/

#ifndef _VPR_SYSTEM_BASE_H_
#define _VPR_SYSTEM_BASE_H_

#include <vpr/vprConfig.h>
#include <string>

#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif


namespace vpr
{

#if defined(HAVE_TIMEVAL) && ! defined(VPR_OS_Windows)

typedef struct timeval TimeVal;
#else

struct TimeVal
{
   long tv_sec;           
   long tv_usec;          
};
#endif

#ifdef HAVE_TIMEZONE
typedef struct timezone TimeZone;
#else

struct TimeZone
{
   int tv_minuteswest;    
   int tv_dsttime;        
};
#endif

class VPR_CLASS_API SystemBase
{
public:
   static int getEndian()
   {
      union
      {
         char   c[sizeof(short)];
         short  value;
      } endian;

      // The way this works is that we access the first byte of endian.value
      // directly.  If it is 1, the host treats that as the high-order byte.
      // Otherwise, it is the low-order byte.
      endian.value = 256;

      return endian.c[0];
   }

   static bool isLittleEndian()
   {
      return(getEndian() == 0);
   }

   static bool isBigEndian()
   {
      return(getEndian() == 1);
   }

   static std::string getCallStack();
};

} // End of vpr namespace


#endif   /* _VPR_SYSTEM_BASE_H_ */

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