libs/ardour/cycle_timer.cc

   1 /*
   2     Copyright (C) 2002 Andrew Morton
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <cstdio>
  21 #include <pbd/error.h>
  22 #include <ardour/cycle_timer.h>
  23
  24 #include "i18n.h"
  25
  26 using namespace PBD;
  27
  28 float CycleTimer::cycles_per_usec = 0;
  29
  30 float
  31 CycleTimer::get_mhz()
  32 {
  33         FILE *f;
  34
  35         if ((f = fopen("/proc/cpuinfo", "r")) == 0) {
  36                 fatal << _("CycleTimer::get_mhz(): can't open /proc/cpuinfo") << endmsg;
  37                 /*NOTREACHED*/
  38                 return 0.0f;
  39         }
  40
  41         while (true) {
  42
  43                 float mhz;
  44                 int ret;
  45                 char buf[1000];
  46
  47                 if (fgets (buf, sizeof(buf), f) == 0) {
  48                         fatal << _("CycleTimer::get_mhz(): cannot locate cpu MHz in /proc/cpuinfo") << endmsg;
  49                         /*NOTREACHED*/
  50                         return 0.0f;
  51                 }
  52
  53 #ifdef __powerpc__
  54
  55                 int   imhz;
  56
  57                 /* why can't the PPC crew standardize their /proc/cpuinfo format ? */
  58                 ret = sscanf (buf, "clock\t: %dMHz", &imhz);
  59                 mhz = (float) imhz;
  60
  61 #else /* XXX don't assume its x86 just because its not power pc */
  62                 ret = sscanf (buf, "cpu MHz         : %f", &mhz);
  63
  64 #endif
  65                 if (ret == 1) {
  66                         fclose(f);
  67                         return mhz;
  68                 }
  69         }
  70
  71         fatal << _("cannot locate cpu MHz in /proc/cpuinfo") << endmsg;
  72         /*NOTREACHED*/
  73         return 0.0f;
  74 }