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86 lines
2.1 KiB
V
86 lines
2.1 KiB
V
module time
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#include <mach/mach_time.h>
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const (
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// start_time is needed on Darwin and Windows because of potential overflows
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start_time = C.mach_absolute_time()
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time_base = init_time_base()
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)
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[typedef]
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struct C.mach_timebase_info_data_t {
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numer u32
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denom u32
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}
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fn C.mach_absolute_time() u64
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fn C.mach_timebase_info(&C.mach_timebase_info_data_t)
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fn C.clock_gettime_nsec_np(int) u64
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struct InternalTimeBase {
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numer u32 = 1
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denom u32 = 1
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}
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pub struct C.timeval {
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tv_sec u64
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tv_usec u64
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}
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fn init_time_base() InternalTimeBase {
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tb := C.mach_timebase_info_data_t{}
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C.mach_timebase_info(&tb)
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return InternalTimeBase{numer:tb.numer, denom:tb.denom}
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}
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fn sys_mono_now_darwin() u64 {
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tm := C.mach_absolute_time()
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if time_base.denom == 0 {
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C.mach_timebase_info(&time_base)
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}
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return (tm - start_time) * time_base.numer / time_base.denom
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}
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// NB: vpc_now_darwin is used by `v -profile` .
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// It should NOT call *any other v function*, just C functions and casts.
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[inline]
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fn vpc_now_darwin() u64 {
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tm := C.mach_absolute_time()
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if time_base.denom == 0 {
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C.mach_timebase_info(&time_base)
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}
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return (tm - start_time) * time_base.numer / time_base.denom
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}
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// darwin_now returns a better precision current time for Darwin based operating system
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// this should be implemented with native system calls eventually
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// but for now a bit tweaky. It uses the deprecated gettimeofday clock to get
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// the microseconds seconds part and converts to local time
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[inline]
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fn darwin_now() Time {
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// get the high precision time as UTC clock
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tv := C.timeval{}
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C.gettimeofday(&tv, 0)
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loc_tm := C.tm{}
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C.localtime_r(&tv.tv_sec, &loc_tm)
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return convert_ctime(loc_tm, int(tv.tv_usec))
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}
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// darwin_utc returns a better precision current time for Darwin based operating system
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// this should be implemented with native system calls eventually
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// but for now a bit tweaky. It uses the deprecated gettimeofday clock to get
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// the microseconds seconds part and normal local time to get correct local time
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[inline]
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fn darwin_utc() Time {
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// get the high precision time as UTC clock
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tv := C.timeval{}
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C.gettimeofday(&tv, 0)
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return unix2(int(tv.tv_sec), int(tv.tv_usec))
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}
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