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cycle_timer.cc

/*
    Copyright (C) 2002 Andrew Morton

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <cstdio>
#include <pbd/error.h>
#include <ardour/cycle_timer.h>

#include "i18n.h"

using namespace PBD;

float CycleTimer::cycles_per_usec = 0;

float
CycleTimer::get_mhz()
{
      FILE *f;
      
      if ((f = fopen("/proc/cpuinfo", "r")) == 0) {
            fatal << _("CycleTimer::get_mhz(): can't open /proc/cpuinfo") << endmsg;
            /*NOTREACHED*/
            return 0.0f;
      }

      while (true) {

            float mhz;
            int ret;
            char buf[1000];

            if (fgets (buf, sizeof(buf), f) == 0) {
                  fatal << _("CycleTimer::get_mhz(): cannot locate cpu MHz in /proc/cpuinfo") << endmsg;
                  /*NOTREACHED*/
                  return 0.0f;
            }

#ifdef __powerpc__

            int   imhz;

            /* why can't the PPC crew standardize their /proc/cpuinfo format ? */
            ret = sscanf (buf, "clock\t: %dMHz", &imhz);
            mhz = (float) imhz;

#else /* XXX don't assume its x86 just because its not power pc */
            ret = sscanf (buf, "cpu MHz         : %f", &mhz);

#endif
            if (ret == 1) {
                  fclose(f);
                  return mhz;
            }
      }

      fatal << _("cannot locate cpu MHz in /proc/cpuinfo") << endmsg; 
      /*NOTREACHED*/
      return 0.0f;
}

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