guint i, count, ret;
gint extraEvent = 0;
guint64 initialTimeStamp, previousTimeStamp;
- LttvTracesetPosition *initialPos, *previousPos, *currentPos;
-
+ LttvTracesetPosition *initialPos, *previousPos, *currentPos, beginPos;
+ struct bt_iter_pos pos;
+ beginPos.bt_pos = &pos;
+ beginPos.iter = ts->iter;
+ beginPos.bt_pos->type = BT_SEEK_BEGIN;
+ beginPos.timestamp = G_MAXUINT64;
+ beginPos.cpu_id = INT_MAX;
/*Save initial position of the traceset*/
initialPos = lttv_traceset_create_current_position (ts);
break;
currentPos = lttv_traceset_create_time_position(ts,ltt_time_from_uint64(previousTimeStamp));
+ /*Corner case: When we are near the beginning of the trace and the previousTimeStamp is before
+ * the beginning of the trace. We have to seek to the first event.
+ */
+ if((lttv_traceset_position_compare(currentPos,&beginPos ) == 0)){
+ lttv_traceset_seek_to_position(&beginPos);
+ break;
+ }
/*move traceset position */
lttv_state_traceset_seek_position(ts, previousPos);
/* iterate to the initial position counting the number of event*/
count++;
}
}while(ret != 0);
- lttv_traceset_destroy_position(currentPos);
+
/*substract the desired number of event to the count*/
extraEvent = count - n;
- if(extraEvent >= 0){
+ if (extraEvent >= 0) {
//if the extraEvent is over 0 go back to previousPos and
//move forward the value of extraEvent times
lttv_state_traceset_seek_position(ts, previousPos);
}
break; /* we successfully seeked backward */
}
- else{ /* if the extraEvent is below 0 create a position before and start over*/
- ratio = ratio * 16;
+ else{
+ /* if the extraEvent is below 0 create a position before and start over*/
+ ratio = ratio * 16;
}
+ lttv_traceset_destroy_position(currentPos);
}
return 0;
}