L2SDP-499, changes to prevent 100% load after returning from sleep/hibernate.

src/sdptr.cpp

@@ -76,7 +76,19 @@ void monitor()
 
 
     while (ServerRunning) {
+        struct timespec current_time_timespec;
+        clock_gettime(CLOCK_REALTIME, (struct timespec *)&current_time_timespec);
+
         SD.t0.tv_sec = SD.t0.tv_sec + SD.timetick;  // specify next position in time
+        if (SD.t0.tv_sec < current_time_timespec.tv_sec) {
+            // skip ahead if we already are beyond the next tick.
+            // this prevents us from trying to catch up if the host system
+            // was in hibernation or this process was otherwise suspended.
+            // this means that SD.uptime will reflect the number of seconds
+            // this process was actually running, and now - SD.start_time
+            // reflects the wall-clock time that passed since start.
+            SD.t0.tv_sec = current_time_timespec.tv_sec + SD.timetick;
+        }
         SD.t0.tv_nsec = 10000000L;  // 0..999999999 // offset 10ms in a new second
         pthread_mutex_lock(&SD.newpoint_lock);
         pthread_cond_timedwait(&SD.newpoint_cond, &SD.newpoint_lock, (const struct timespec *)&SD.t0);