27 lines
603 B
C
27 lines
603 B
C
#include <time.h>
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#include <mach/mach_time.h>
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#define ORWL_NANO (+1.0E-9)
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#define ORWL_GIGA UINT64_C(1000000000)
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int
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clock_gettime(int clock_id, struct timespec *tp)
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{
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static double orwl_timebase = 0.0;
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static uint64_t orwl_timestart = 0;
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if (!orwl_timestart) {
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mach_timebase_info_data_t tb = { 0 };
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mach_timebase_info(&tb);
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orwl_timebase = tb.numer;
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orwl_timebase /= tb.denom;
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orwl_timestart = mach_absolute_time();
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}
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double diff = (mach_absolute_time() - orwl_timestart) * orwl_timebase;
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tp->tv_sec = diff * ORWL_NANO;
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tp->tv_nsec = diff - (tp->tv_sec * ORWL_GIGA);
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return 0;
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}
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