release/src/router/dnscrypt/src/libnacl/cpucycles/sgi.c

   1 #include <time.h>
   2 #include <stdio.h>
   3 #include <unistd.h>
   4 #include <sys/time.h>
   5 #include <sys/types.h>
   6 #include <sys/param.h>
   7 #include <sys/sysctl.h>
   8
   9 static double cpufrequency = 0;
  10
  11 static void init(void)
  12 {
  13   FILE *f;
  14
  15   f = popen("hinv -c processor | awk '{if ($3==\"MHZ\") print $2*1000000}'","r");
  16   if (!f) return;
  17   if (fscanf(f,"%lf",&cpufrequency) < 1) cpufrequency = 0;
  18   pclose(f);
  19   if (!cpufrequency) return;
  20 }
  21
  22 long long cpucycles_sgi(void)
  23 {
  24   double result;
  25   struct timespec t;
  26   if (!cpufrequency) init();
  27   clock_gettime(CLOCK_SGI_CYCLE,&t);
  28   result = t.tv_nsec;
  29   result *= 0.000000001;
  30   result += (double) t.tv_sec;
  31   result *= cpufrequency;
  32   return result;
  33 }
  34
  35 long long cpucycles_sgi_persecond(void)
  36 {
  37   if (!cpufrequency) init();
  38   return cpufrequency;
  39 }