| 摘要 |
PURPOSE:To efficiently execute the processing by updating the address information of an index area so that whenever a data is written in a data write area, its area becomes a read-out area, and also, whenever the data is read out in a lump from a data read-out area, its area becomes a write area. CONSTITUTION:An index area 21 for recording the address information of an area separately for a data write area and a data read-out area is provided on a disk file 20, and the address information of the index area 21 is updated so that whenever a data is written in the data write area, the area in which the data has been written becomes a data read-out area, and the address information of the index area 21 is updated so that in case when a data has been read out in a lump from the data read-out area, the area from which the data has been read out becomes a data write area. IN such a way, write of the data to a disk file and read-out from the disk file can be executed simultaneously and efficiently.
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