common/JackTime.c

   1 /*
   2         Copyright (C) 2001-2003 Paul Davis
   3         Copyright (C) 2004-2006 Grame
   4
   5         This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19 */
  20
  21 #include "JackTime.h"
  22 #include "JackError.h"
  23
  24 #ifdef __APPLE__
  25
  26 double __jack_time_ratio;
  27
  28 /* This should only be called ONCE per process. */
  29 void InitTime()
  30 {
  31         JackLog("InitTime\n");
  32         mach_timebase_info_data_t info;
  33     mach_timebase_info(&info);
  34     __jack_time_ratio = ((float)info.numer / info.denom) / 1000;
  35 }
  36
  37 #endif
  38
  39 #ifdef WIN32
  40
  41 EXPORT LARGE_INTEGER _jack_freq;
  42
  43 void InitTime()
  44 {
  45         QueryPerformanceFrequency(&_jack_freq);
  46         JackLog("InitTime freq = %ld  %ld\n", _jack_freq.HighPart, _jack_freq.LowPart);
  47         _jack_freq.QuadPart = _jack_freq.QuadPart / 1000000; // by usec
  48 }
  49
  50 jack_time_t GetMicroSeconds(void)
  51 {
  52         LARGE_INTEGER t1;
  53         QueryPerformanceCounter (&t1);
  54         return (jack_time_t)(((double)t1.QuadPart)/((double)_jack_freq.QuadPart));
  55 }
  56
  57 // TODO
  58 #endif
  59
  60 #ifdef linux
  61
  62 #ifdef GETCYCLE_TIME
  63
  64 #include <stdio.h>
  65 jack_time_t GetMhz(void)
  66 {
  67         FILE *f = fopen("/proc/cpuinfo", "r");
  68         if (f == 0)
  69         {
  70                 perror("can't open /proc/cpuinfo\n");
  71                 exit(1);
  72         }
  73
  74         for ( ; ; )
  75         {
  76                 jack_time_t mhz;
  77                 int ret;
  78                 char buf[1000];
  79
  80                 if (fgets(buf, sizeof(buf), f) == NULL) {
  81                         jack_error ("FATAL: cannot locate cpu MHz in "
  82                                     "/proc/cpuinfo\n");
  83                         exit(1);
  84                 }
  85
  86 #if defined(__powerpc__)
  87                 ret = sscanf(buf, "clock\t: %" SCNu64 "MHz", &mhz);
  88 #elif defined( __i386__ ) || defined (__hppa__)  || defined (__ia64__) || \
  89       defined(__x86_64__)
  90                 ret = sscanf(buf, "cpu MHz         : %" SCNu64, &mhz);
  91 #elif defined( __sparc__ )
  92                 ret = sscanf(buf, "Cpu0Bogo        : %" SCNu64, &mhz);
  93 #elif defined( __mc68000__ )
  94                 ret = sscanf(buf, "Clocking:       %" SCNu64, &mhz);
  95 #elif defined( __s390__  )
  96                 ret = sscanf(buf, "bogomips per cpu: %" SCNu64, &mhz);
  97 #else /* MIPS, ARM, alpha */
  98                 ret = sscanf(buf, "BogoMIPS        : %" SCNu64, &mhz);
  99 #endif
 100                 if (ret == 1)
 101                 {
 102                         fclose(f);
 103                         return (jack_time_t)mhz;
 104                 }
 105         }
 106 }
 107
 108 jack_time_t __jack_cpu_mhz;
 109
 110 void InitTime()
 111 {
 112         __jack_cpu_mhz = GetMhz();
 113 }
 114
 115 #else
 116 void InitTime()
 117 {}
 118
 119 #endif
 120
 121 #endif