+static inline struct timeval tvadd(const struct timeval a,
+ const struct timeval b) {
+ struct timeval r;
+
+ r.tv_sec = a.tv_sec + b.tv_sec;
+ r.tv_usec = a.tv_usec + b.tv_usec;
+ if(r.tv_usec < 0) {
+ r.tv_usec += 1000000;
+ r.tv_sec--;
+ }
+ if(r.tv_usec > 999999) {
+ r.tv_usec -= 1000000;
+ r.tv_sec++;
+ }
+ return r;
+}
+
+static inline double tvdouble(const struct timeval a) {
+ return a.tv_sec + a.tv_usec / 1000000.0;
+}
+
+static inline int64_t tvsub_us(const struct timeval a,
+ const struct timeval b) {
+ return (((uint64_t)a.tv_sec * 1000000 + a.tv_usec)
+ - ((uint64_t)b.tv_sec * 1000000 + b.tv_usec));
+}
+
+/** @brief Great-than comparison for timevals */
+static inline int tvgt(const struct timeval *a, const struct timeval *b) {
+ if(a->tv_sec > b->tv_sec)
+ return 1;
+ if(a->tv_sec == b->tv_sec
+ && a->tv_usec > b->tv_usec)
+ return 1;
+ return 0;
+}
+
+/** @brief Less-than
+ comparison for timevals */
+static inline int tvlt(const struct timeval *a, const struct timeval *b) {
+ if(a->tv_sec < b->tv_sec)
+ return 1;
+ if(a->tv_sec == b->tv_sec
+ && a->tv_usec < b->tv_usec)
+ return 1;
+ return 0;
+}
+
+/** @brief Greater-than-or-equal comparison for timevals */
+static inline int tvge(const struct timeval *a, const struct timeval *b) {
+ return !tvlt(a, b);
+}
+
+/** @brief Less-than-or-equal comparison for timevals */
+static inline int tvle(const struct timeval *a, const struct timeval *b) {
+ return !tvgt(a, b);
+}
+