int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y);
int timeval_add_time(struct timeval *result, long sec, long usec);
+int timeval_compare(const struct timeval *x, const struct timeval *y);
/** @returns gettimeofday() timeval as 64-bit in ms */
int64_t timeval_ms(void);