ref: 7a42ced8a2c76e51e4a2e7ae60e7d3bf19b24904 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);