mach.c


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#include "mach.h"

/* there is no clock_gettime on MacOS platform */
int clock_gettime(int clk_id, struct timespec *t)
{
    mach_timebase_info_data_t timebase;
    mach_timebase_info(&timebase);
    
    uint64_t time;
    
    time = mach_absolute_time();
    
    double nseconds = ((double)time * (double)timebase.numer) / ((double)timebase.denom);
    double seconds = ((double)time * (double)timebase.numer) / ((double)timebase.denom * 1e9);
    
    t->tv_sec = seconds;
    t->tv_nsec = nseconds;
    
    return 0;
}