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v/vlib/time/time_darwin.c.v

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module time
#include <mach/mach_time.h>
const (
// start_time is needed on Darwin and Windows because of potential overflows
start_time = C.mach_absolute_time()
time_base = init_time_base()
)
[typedef]
struct C.mach_timebase_info_data_t {
numer u64
denom u64
}
fn C.mach_absolute_time() u64
fn C.mach_timebase_info(&C.mach_timebase_info_data_t)
struct InternalTimeBase {
numer u64
denom u64
}
fn init_time_base() InternalTimeBase {
mut tb := C.mach_timebase_info_data_t{}
C.mach_timebase_info(&tb)
return InternalTimeBase{numer:tb.numer, denom:tb.denom}
}
fn sys_mono_now_darwin() u64 {
tm := C.mach_absolute_time()
return mul_div(tm - start_time, time_base.numer, time_base.denom)
}
fn mul_div(val, numer, denom u64) u64 {
q := val / denom
r := val % denom
return q * numer + r * numer / denom
}