Fix issue causing infinite loop

latency-measure/src/main.c

@@ -36,6 +36,9 @@ static inline int64_t diff_ns(struct timespec t1, struct timespec t2) {
   diff = NSECS_PER_SECOND * (t1.tv_sec - t2.tv_sec);
   diff += ((int64_t)t1.tv_nsec) - ((int64_t)t2.tv_nsec);
 
+  if( diff < 0 )
+    diff = -diff;
+
   return diff;
 }
 
@@ -91,7 +94,7 @@ static void *timerthread_poll(void *p) {
 
     for(;;) {
       clock_gettime(CLOCK_ID, &current);
-      if( current.tv_nsec == next.tv_nsec)
+      if( current.tv_nsec >= next.tv_nsec)
         break;
     }