JPH05151053A - File control system - Google Patents

Abstract

PURPOSE:To easily perform the addition, alteration, deletion, etc., of a file during the execution of a system and to generate no contradiction even if the same system is used by one machine at the same time. CONSTITUTION:A working temporary file control means 2 controls a working temporary file with a working temporary file control file 1 so that the same file name is not used. A file control means 4 dynamically controls all files by using a file control table 3. A file assignment control means 6 dynamically control the assignment states of all the files by using a file assignment state control table 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file control system in a computer-based system.

[0002]

2. Description of the Related Art Large-scale systems such as CAD and CA
Many files are handled in systems such as M and CAE.

In such a system that handles many files, file control is performed by the file management means in order to centrally manage the files. Note that it is common to manage information about files using a file management table.

Further, in systems such as CAD, CAM, and CAE, a work temporary file is used to temporarily store data during execution of processing.

By the way, in the conventional file control method, the system fixedly determines the table number of the file management table and the files used in the system including the working temporary file. As for temporary files for work, the number of used files was registered in the file management table before or immediately after execution of the system. This is for reasons such as facilitating file control.

Also, the system fixedly determines the file name for identifying the working temporary file.

[0007]

Since the conventional file control method is performed as described above, it has the following drawbacks.

It is not easy to add, change, delete, etc., files used in the system, including temporary files for work, during execution of the system. In other words, the contents of the file management table are fixed before or immediately after the system starts to be executed. Therefore, to add, change, or delete files, recreate the file management table and open the file management table. This is because it is necessary to recreate all the modules used and recreate the system. Therefore, there is a limitation in incorporating the system user's own file into the system.

It is difficult to use the same system on one machine (computer) at the same time. That is, since the file name of the working temporary file is fixedly set by the system, the system that was started later uses the working temporary file of the same file name that is used by the system that has already been started. In some cases, the data stored in the working temporary file will be destroyed.

The present invention has been proposed in view of the above points, and it is an object of the present invention to easily add, change, delete, etc. files while the system is running, and to provide a single machine. The purpose is to provide a file control method that does not cause inconsistency even if the same system is used at the same time.

[0011]

In order to achieve the above object, the present invention achieves the above object by using a working temporary file management file for managing a working temporary file by a working temporary file management file and a file management table for all files. A file managing means for managing and a file assigning status managing means for managing the assigning status of all files by the file assigning status management table are provided.

[0012]

In the file control method of the present invention, the working temporary file management means manages the working temporary file by the working temporary file management file, and the file management means manages all files by the file management table. Then, the file assignment status management means manages the assignment status of all files by using the file assignment status management table.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the file control system of the present invention.

In FIG. 1, in the present embodiment, a work temporary file management means 2 for managing a work temporary file by a work temporary file management file 1 and a file management for managing all files by a file management table 3. It is composed of a means 4 and a file assignment state management means 6 for managing the assignment states of all files by means of the file assignment state management table 5.

Work temporary file management file 1
Stores information about the usage status of the work temporary file, and stores, for example, a plurality of records having a file name item of the work temporary file and a file used / unused flag item. In addition, as the file name of the temporary file for work,
For example, initial letters are fixed and numbers are followed to facilitate identification.

The file management table 3 stores information necessary for managing files to be used. For example, the table number, logical file name, file type, file usage status, and file position are stored in the file management table 3. Have Here, the table number is a number that distinguishes an entry corresponding to a file, and is also a file number that identifies a file. The logical file name identifies the file to be used, the file type identifies sequential organization, direct organization, etc., and the file usage status indicates whether or not it is open, and if it is open It is for identifying whether the file is open for writing or for writing, and the position in the file indicates the starting position in the file when reading or writing the file.

The file assignment status management table 5 stores information indicating the file assignment status, and has, for example, a table number and a file assignment status flag. In order to identify the corresponding file, the table number is the same as the table number of the file management table 3, and the number of tables is the same. From this, it can be said that the file assignment status management table 5 indicates the usage status of the table number of the file management table 3.

The operation of the above-described embodiment will be described below for different cases.

(1) File Assignment Processing When assigning a file, a system program or a user program (not shown) notifies the file management means 4 of that fact.

The file management means 4 issues a request for a usable table number to the file assignment state management means 6 in order to obtain a table number that can be used in the file management table 3 as a preparation for file assignment.

Upon receipt of the request, the file assignment state management means 6 searches the file assignment state management table 5 for a table number showing a state where the file assignment state flag is unused, and uses one of the found table numbers as a file. It is returned to the management means 4.

At this time, the file assignment state management means 6
Sets the file assignment state flag of the file assignment state management table 5 corresponding to the table number returned to the file management means 4 to the in-use state (assignment).

The file management means 4 writes necessary information in the file management table 3 using the table number returned from the file assignment state management means 6 as an information storage key. That is, the logical file name, file type, file usage state, file position, etc. are written.

Further, since the table number returned from the file assignment state management means 6 to the file management means 4 serves as a search key in the subsequent processing, the file management means 4 carries out the table number as the post-processing of the file assignment. Inform the user.

(2) File read / write processing When a file is read / written, the system program or user program uses the table number returned by the file assignment processing as a search key to inform the file management means 4 of information. Request acquisition.

The file management means 4 acquires necessary information from the file management table 3 using the designated table number.

Then, the system program or the user program reads and writes the file based on the acquired information.

(3) File closing process When the file is closed, the system program or the user program specifies the table number returned in the file assigning process and notifies the file assigning state management means 6 of that fact.

The file assignment state management means 6 sets the file assignment state flag at the designated table number of the file assignment state management table 5 to the unused state (release of assignment).

(4) Processing for starting use of working temporary file When a working temporary file is used, the system program or the user program notifies the working temporary file management means 2 to that effect.

The temporary file management means 2 for work is
All records are read from the working temporary file management file 1, and the file use /
Get the names of all files in use as temporary files for work by referring to the unused flag.

The temporary file management means 2 for work is
Determine the file name of the working temporary file to be used from now on so that the file name is not the same as the file name of the working temporary file being used, and make it a record with the used / unused flag. It is registered in the work temporary file management file 1. When the initials of the file name are fixed, the file name can be simplified by identifying the record with the number obtained by removing the initials from the file name as the record number.

Next, the work temporary file management means 2 notifies the file management means 4 of various file information such as the file name and file type used as the work temporary file.

The file management means 4 performs the above-mentioned "(1) file assignment processing", and gives the working temporary file management means 2 the table number in the file management table 3.

The working temporary file management means 2 is
The acquired table number and the file name of the working temporary file are managed, and the table number is notified to the user as the working temporary file management number.

(5) Saving information to working temporary file and fetching saved information When saving information to the working temporary file or fetching saved information, the system program or user program is Using the work temporary file management number returned in the process of starting the use of the temporary file for use, the information is saved or retrieved by the above-mentioned "(2) File reading / writing process".

(6) Ending Use of Working Temporary File When ending the use of the working temporary file, the system program or the user program specifies the working temporary file management number to the working temporary file management means 2. Tell them that.

The temporary file management means 2 for work is
The file use / unuse flag of the record for the work temporary file management number in the work temporary file management file 1 is set to the unused state. When the initial letters of the file name of the working temporary file are fixed, the file use / unused flag of the record of the record number corresponding to the number excluding the initial letters of the file name is set to unused and is written again.

Then, the above-mentioned "(3) File closing process" is performed using the temporary file management number for work.

[0041]

As described above, the file control system of the present invention has the following effects.

Since the contents of the file management table can be changed without distinguishing whether the system is being started or not being executed,
It is easy to add, change, delete, etc., the files used in the system, including the temporary files for work, and it becomes easy to incorporate the system user's own files into the system.

In order to manage the temporary files for work so that the file names do not conflict with each other, 1
Even if a plurality of machines use the same system at the same time, there is no problem and the utilization efficiency of the machine and the system can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a file control system of the present invention.

[Explanation of symbols]

 1 ... Temporary file management file for work 2 ... Temporary file management means for work 3 ... File management table 4 ... File management means 5 ... File assignment status management table 6 ... File assignment status management means

Claims (3)

[Claims] 1. A work temporary file management means for managing a work temporary file by a work temporary file management file; a file management means for managing all files by a file management table; and a file assignment state management table for all files. A file control method comprising: a file assignment state management means for managing a file assignment state. 2. The work temporary file management file is composed of a plurality of records having a file name item of the work temporary file and a file used / unused flag item. File control method. 3. The file management table has items of a table number, a logical file name, a file type, a file usage status, and a file position, and the file assignment status management table has a table number and a file assignment status common to the file management table. 3. The file control method according to claim 1, further comprising a flag item.