module time #include 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 u32 denom u32 } fn C.mach_absolute_time() u64 fn C.mach_timebase_info(&C.mach_timebase_info_data_t) fn C.clock_gettime_nsec_np(int) u64 struct InternalTimeBase { numer u32 = 1 denom u32 = 1 } pub struct C.timeval { tv_sec u64 tv_usec u64 } fn init_time_base() C.mach_timebase_info_data_t { tb := C.mach_timebase_info_data_t{} C.mach_timebase_info(&tb) return C.mach_timebase_info_data_t{ numer: tb.numer denom: tb.denom } } fn sys_mono_now_darwin() u64 { tm := C.mach_absolute_time() if time.time_base.denom == 0 { C.mach_timebase_info(&time.time_base) } return (tm - time.start_time) * time.time_base.numer / time.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.time_base.denom == 0 { C.mach_timebase_info(&time.time_base) } return (tm - time.start_time) * time.time_base.numer / time.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 converts to local time fn darwin_now() Time { // get the high precision time as UTC clock tv := C.timeval{} C.gettimeofday(&tv, 0) loc_tm := C.tm{} asec := voidptr(&tv.tv_sec) C.localtime_r(&time_t(asec), &loc_tm) return convert_ctime(loc_tm, int(tv.tv_usec)) } // darwin_utc 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 fn darwin_utc() Time { // get the high precision time as UTC clock tv := C.timeval{} C.gettimeofday(&tv, 0) return unix2(int(tv.tv_sec), int(tv.tv_usec)) }