| 摘要 |
PURPOSE:To increase the processing speed when data are updated and restored respectively by providing a data storing part, an information control table, a pointer updating log control table, a data updating processing part, and a data restoring processing part. CONSTITUTION:A data updating processing part 11 acquires the data updating right with the use of a data updating sequence flag F. Then a marker M under updating data is set after the current pointers Wi of each data area group to be updated are all saved into a pointer updating log control table L. Then the data areas of the structures opposite to the data area pointed by the pointers Wi are updated. The pointers Wi are changed into the values that point the data areas having the opposite structures. Simultaneously, a data restoring processing part 12 sets again the contents of all updated Li included in the table L to the pointers Wi included in an information control table T. Thus the contents of the data areas A and ai are reset to the state before updating. In such a constitution, the processing speed is increased when the data are updated and restored, respectively. |
