JPH0477932A - Data update system - Google Patents

Abstract

PURPOSE:To simultaneously execute a data processing in plural tasks without prohibiting data input from a file by saving input data on the data processing, recognizing that input data is not altered when a file device is rewritten so as to rewrite data. CONSTITUTION:A preprocessing data storage area 101 storing data before the data processing is executed, a present data storage area 102 reading data on the updated place of a storage device, and a comparison means 103 comparing the contents of the preprocessing data storage area 101 and the present data storage area 102 are provided. Furthermore, a rewrite means 104 rewriting the updated place by data after the data processing is executed when the compared results of the comparison means 103 coincide is provided. Thus, post processed data in the data processing 001 is transmitted to the rewrite means 104 when the compared results coincide, and data is rewritten. Thus, plural tasks can simultaneously execute the data processing without prohibiting reading from the other tasks.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to update processing of a file device, and more particularly to simultaneous update processing of a system operating with multiple tasks.

[Conventional technology]

Conventionally, this type of processing prevented multiple tasks from making different updates to the same location at the same time by prohibiting other tasks from reading that location when one task read an updated location. .

[Problem to be solved by the invention]

In the conventional method, processing of a task whose reading processing is prohibited will not proceed further, and if this task is an interactive task, operability will deteriorate, and if multiple tasks are prohibited from reading at the same time, it will cause a system deadlock. Something happened.

[Means to solve the problem]

In an information processing system in which multiple tasks access a storage device at the same time, the data update method of the present invention provides a pre-processing data storage area for storing data before data processing and data at an updated location in the storage device. a comparison means for comparing the current data storage area to be read with the contents of the pre-processing data storage area and the current data storage area; and when the comparison results of the comparison means match, the updating with the data after data processing is performed. and rewriting means for rewriting the portion.

Further, the data update method of the present invention includes a plurality of the above-mentioned data update devices, outputs the comparison results of each data update device to the outside, and only when all of the comparison results match, the data update method transmits the above data to each data update device. When the comparison result is notified as a match, the rewriting means operates in each data updating device to rewrite a plurality of updated locations.

〔Example〕

FIG. 1 is a block diagram of a first embodiment of the present invention. In the figure, 001 is data processing, and 100 is data update processing. The data update device 100 includes a pre-processing data storage area 101, a current data storage area 102, and a comparing means 103.
and rewriting means 104.

The pre-processing data storage area 101 stores the data before data processing 001, and the current data storage area 102 stores the data before rewriting at the time when data processing 001 is completed and the data is rewritten. 103 indicates the contents of the pre-processing data storage area 101 and the current data storage area 10
The rewriting means 104 compares the data output as a result of the data processing 001 with the contents of the comparing means 10.
Write back to the file according to the result of step 3.

The data read as input data for the data processing 001 is stored as is in the unprocessed data storage area 101 of the data updating device 100. When the data processing 001 is completed, the data at the same location as the input data is read again and stored in the current data storage area 102.

Next, the comparing means 103 compares these two data storage areas 1.
The contents of 01 and 102 are compared. If they match, the processed data of data processing 001 is sent to the rewriting means 104, and rewriting is executed. If the comparison result is a mismatch, rewriting is not performed, and data processing 001 performs reprocessing using the contents of the current data as input data.

FIG. 2 is a block diagram of a second embodiment of the invention. In the figure, 002 is data processing that executes multiple processing;
00 to 300 are the above data update devices, respectively.

AND device 900 is data update device floo, 200,
The results of the 300 comparison means are ANDed.

When the outputs of the A and ND devices N900 all match, the data updating devices 100, 200, and 300 rewrite the results of the data processing 002. If there is even one mismatch in the output of the AND device 900, the data processing 002 performs reprocessing.

〔Effect of the invention〕

As explained above, the present invention saves input data for data processing, and executes rewriting after confirming that the input data has not been changed at the time of rewriting the file device. This has the effect of allowing data processing to be executed simultaneously in multiple tasks without prohibiting data input.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention, and FIG.
The figure is a block diagram showing the second embodiment. 001.002...Data processing, 100,200°3
00... Data update device, 101... Pre-processing data storage area, 102... Current data storage area, 103.
・Comparison means, 104 ・Rewriting means, 9oo・
...AND processing.

Claims (1)

[Claims] 1. In an information processing system in which multiple tasks access a storage device at the same time, a pre-processing data storage area stores data before data processing is performed, and data at an updated location in the storage device is stored. a comparison means for comparing the current data storage area to be read with the contents of the pre-processing data storage area and the current data storage area; and when the comparison results of the comparison means match, the updating with the data after data processing is performed. 1. A data updating device comprising: rewriting means for rewriting a portion. 2. It includes a plurality of data update devices according to claim 1, outputs the comparison results of each data update device to the outside, and only when all of the comparison results are a match, allows each data update device to output the comparison results as a match. A data update method characterized in that, when notified, a rewrite means operates in each data update device to rewrite a plurality of updated locations.