extern uint64_t mtime_since(const struct timeval *, const struct timeval *);
extern uint64_t mtime_since_now(const struct timeval *);
extern uint64_t time_since_now(const struct timeval *);
+extern uint64_t time_since_genesis(void);
extern uint64_t mtime_since_genesis(void);
extern uint64_t utime_since_genesis(void);
extern void usec_spin(unsigned int);