release/src/router/dnscrypt/src/libnacl/cpucycles/monotoniccpuinfo.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 #include "osfreq.c"
   9
  10 static double cpufrequency = 0;
  11
  12 static void init(void)
  13 {
  14   cpufrequency = osfreq();
  15 }
  16
  17 long long cpucycles_monotoniccpuinfo(void)
  18 {
  19   double result;
  20   struct timespec t;
  21   if (!cpufrequency) init();
  22   clock_gettime(CLOCK_MONOTONIC,&t);
  23   result = t.tv_nsec;
  24   result *= 0.000000001;
  25   result += (double) t.tv_sec;
  26   result *= cpufrequency;
  27   return result;
  28 }
  29
  30 long long cpucycles_monotoniccpuinfo_persecond(void)
  31 {
  32   if (!cpufrequency) init();
  33   return cpufrequency;
  34 }