double cycle_per_nsec; //Cycles per nsec
unsigned cur_heart_beat_number; //current number of heart beat in the buf
LttCycleCount cur_cycle_count; //current cycle count of the event
+ void * last_event_pos;
LttTime prev_block_end_time; //the end time of previous block
LttTime prev_event_time; //the time of the previous event