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 {
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numer u32
denom u32
}
fn C.mach_absolute_time() u64
fn C.mach_timebase_info(&C.mach_timebase_info_data_t)
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fn C.clock_gettime_nsec_np(int) u64
struct InternalTimeBase {
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numer u32 = 1
denom u32 = 1
}
pub struct C.timeval {
tv_sec u64
tv_usec u64
}
fn init_time_base() InternalTimeBase {
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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()
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if time_base.denom == 0 {
C.mach_timebase_info(&time_base)
}
return (tm - start_time) * time_base.numer / time_base.denom
}
// NB: vpc_now_darwin is used by `v -profile` .
// It should NOT call *any other v function*, just C functions and casts.
[inline]
fn vpc_now_darwin() u64 {
tm := C.mach_absolute_time()
if time_base.denom == 0 {
C.mach_timebase_info(&time_base)
}
return (tm - start_time) * time_base.numer / time_base.denom
}
// darwin_now returns a better precision current time for Darwin based operating system
// this should be implemented with native system calls eventually
// but for now a bit tweaky. It uses the deprecated gettimeofday clock to get
// the microseconds seconds part and normal local time to get correct local time
// if the time has shifted on a second level between calls it uses
// zero as microsecond. Not perfect but better that unix time only us a second
fn darwin_now() Time {
// get the high precision time as UTC clock
// and use the nanoseconds part
tv := C.timeval{}
C.gettimeofday(&tv, 0)
t := C.time(0)
tm := C.localtime(&t)
// if the second part (very rare) is different
// microseconds is set to zero since it passed the second
// also avoid divide by zero if nsec is zero
if int(t) != tv.tv_sec {
return convert_ctime(tm, 0)
}
return convert_ctime(tm, int(tv.tv_usec))
}