src/getticks.c

   1 ////////////////////////////////////////////////////////////////////////////////
   2 // getticks
   3 static struct timespec mclk_sttime; // starting time of monotonic clock
   4
   5 #ifdef __MACH__
   6
   7 #include <sys/time.h>
   8
   9 #define CLOCK_REALTIME                  0
  10 #define CLOCK_MONOTONIC                 1
  11 #define CLOCK_PROCESS_CPUTIME_ID        2
  12 #define CLOCK_THREAD_CPUTIME_ID         3
  13 #define CLOCK_MONOTONIC_RAW             4
  14 #define CLOCK_REALTIME_COARSE           5
  15 #define CLOCK_MONOTONIC_COARSE          6
  16
  17 //clock_gettime is not implemented on OSX
  18 // This implementation is found on the internet. Not sure if it's 100% correct
  19
  20 int clock_gettime(int clk_id, struct timespec* t) {
  21     struct timeval now;
  22     int rv = gettimeofday(&now, NULL);
  23     if (rv) return rv;
  24     t->tv_sec  = now.tv_sec;
  25     t->tv_nsec = now.tv_usec * 1000;
  26     return 0;
  27 }
  28
  29 #endif
  30
  31 static void mclock_init (void) {
  32   clock_gettime(CLOCK_MONOTONIC /*CLOCK_MONOTONIC_RAW*/, &mclk_sttime);
  33 }
  34
  35
  36 static K8TTimeMSec mclock_ticks (void) {
  37   struct timespec tp;
  38   //
  39   clock_gettime(CLOCK_MONOTONIC /*CLOCK_MONOTONIC_RAW*/, &tp);
  40   tp.tv_sec -= mclk_sttime.tv_sec;
  41   return (K8TTimeMSec)tp.tv_sec*1000+(tp.tv_nsec/1000000);
  42 }