ref: 362ffe51df8f1f4f8b3b9bff10c0def2d7aec9a0 dir: /timefuncs.h/
#pragma once double sec_realtime(void); uint64_t nanosec_monotonic(void); void timestring(double s, char *buf, int sz); double parsetime(const char *s); void sleep_ms(int ms);