func: static void monitor_protocol_event_init(void)
  
  {
  
      qemu_mutex_init(&monitor_event_state_lock);
  
      /* Limit RTC & BALLOON events to 1 per second */
  
      monitor_protocol_event_throttle(QEVENT_RTC_CHANGE, 1000);
  
      monitor_protocol_event_throttle(QEVENT_BALLOON_CHANGE, 1000);
  
      monitor_protocol_event_throttle(QEVENT_WATCHDOG, 1000);
  
  }
  