JPS63180146A - Multiplex buffering control system for work file - Google Patents

Abstract

PURPOSE:To improve the availability of a buffer area when the wiring/reading jobs are applied to plural work files by releasing the buffer undergone the multiplex buffering during the input processing. CONSTITUTION:A work file control means 1 produces a buffer segmenting request to a buffer area control means 2 for the output request of a user via a reception terminal for requests given from users according to the state of a free area of a buffer area. If a buffer area is sacred, an output record is written into this buffer area. When the buffer area is not secured, an output record writing request is given to an input/output means 3 of a physical file 5. Then the record set on the work area is controlled. At the same time, it is confirmed whether a record exists in the buffer area or on the file 5 with respect to an input request. Then the record is taken out and returned to the user. The information on a work file control table is changed to the work file open and close requests given from the users.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a work file management system, and more particularly to a multiple buffering control system.

(Conventional technology) Conventionally, in this type of buffering control, a buffer that is no longer needed is released when a work file is opened for output, so unnecessary information exists in the buffer area, reducing the efficiency of buffer area usage. I was letting it happen.

(Problems to be Solved by the Invention) The nine conventional multiple buffering control methods described above have problems in the life cycle of a work file consisting of opening and closing of output and opening and closing of press input.
Since the buffer area is released when the output is opened, unnecessary buffers remain in the buffer area even after the life cycle ends. Therefore, the above method has the disadvantage that the efficiency of buffer area utilization is low.

It is an object of the present invention to eliminate the above-mentioned drawbacks by freeing multi-buffered buffers during input processing,
It is an object of the present invention to provide a multiple buffering control method for work files configured so that the efficiency of buffer area utilization does not decrease.

(Means for Solving the Problems) The work file multiple buffering control method according to the present invention includes a buffer area having a finite size, a buffer area management means, a physical file input/output means, and a work file multiple buffering control method. The system is configured to include a management means.

Buffer area 1! The management means is for alternately extracting necessary buffers from the buffer area and releasing unnecessary buffers.

The physical file input/output means is for executing input/output processing for a physical file functioning as a physical work file.

The work file management means is for executing data input/output processing on the buffer without using the physical file when the contents of the buffer area remain.

(Example) Next, the present invention will be explained in detail with reference to the drawings.

Referring to FIG. 1, one embodiment of the present invention comprises a work file management means 1, a buffer area management means 2, a physical file management means 3, a buffer area 4, and a physical file 5. ing. Here, 21 is a buffer extraction means, and 22 is a buffer return means.

The work file management means 1 is a terminal for receiving requests from users, and issues a buffer cutting request to the buffer area management means 2 in response to a user's output request depending on the state of the free area of the buffer area. If a buffer area can be secured, output records are written to this buffer area. If the buffer area cannot be secured, an output record write request is issued to the input/output means 3 of the physical file 5, and records on the work file are managed. It also checks whether a record exists in the buffer area or in the physical file S in response to an input request, extracts the record, and returns it to the user. In response to a work file open request and close request from a user, information on the work file management table is changed.

FIG. 2 is an explanatory diagram showing details of the work file management means, and FIG. 8 is an explanatory diagram showing the contents of the work file management table.

In FIG. 2, 11 is a work file opening means, 12 is a work file closing means, 13 is an input means from the work file, 14 is an output means to the work file, and 6 is a work file management table. fR
2, the work file management means 1 includes a work file opening means 11, a work file closing means 12, an input means 13 from the work file, and an output means 14 to the work file, and these means are A common work file management table 6 is used to manage the buffer area of the work file and the records inside the buffer area.

In FIG. 8, in the open mode, O is an output, 1 is an input that can be opened, and 2 is an input that cannot be opened.

m8 diagram (in C, 6-I F'IR8T-BUFF
-ER-PTR is a pointer to the first buffer among the multiple buffers of the work file,
The second and subsequent buffers have a list structure using a pointer chain. 6-2 CURRENT-BUFF
ER-PTR is a pointer that points to the buffer that currently stores records at the time of output, or a pointer that points to the buffer from which records are retrieved at the time of input. 6-3O
6-3 OPEN is the current usage status of the work file? This switch is used to set the state given by the user to the work file open means 11.

6-4 DISPLACEMENT represents the position (deviation) of the current record from the beginning of the buffer among a plurality of records held in the buffer.

4 to 6 are flowcharts showing the processing of the work file opening means, the work file closing means, and the input means 13 from the work file, respectively.

In FIG. 6, step 634 is the main part of the present invention, and after all records have been read in the input buffer, a release request is issued to the buffer area management means 2. The same area can be reused.

FIG. 7 is a flowchart showing the processing of the output means 14 to a work file.

6-I FIR8T-BUFFE when the first buffer is secured by the work file open means.
R-PTR and 6-2 CURRENT-BUFFER
-PTR is set to the initial state at the same time. 6-IFI
R8T-BUFFER-PTR points to the start end of multiple buffers. 6-2 CURRENT-BUFFER-P
TR indicates the buffer currently being used by the work file input means 13 and the work file output means 14.

In the work file input means 13, when all records in one buffer are returned, the contents of the buffer are updated,
In the work file output means 14, the contents of the buffer are updated when the buffer is filled with records. When the contents of the buffer are updated in this way, the input means 13 and the output means 14 output 6-2 CURRENT-BU.
FFER-PTR is reset.

6-3 0PEN MODE sets the open mode requested by the user by the work file opening means 61. 6-4 0PEN When MODE is 1, the input means 63 for inputting data from the work file releases the buffer after reading. 6-4
DISPLACEMENT is the relative value within the buffer of a record when outputting a record from the buffer or inputting a record to the buffer.

FIG. 8 is an explanatory diagram showing an example of the use of the work file management means 1 shown in FIG. 1 according to the present invention, and FIGS. 9(a) and (b)
are explanatory diagrams showing the states of the buffer area 4 before and after the transition in FIG. 1, respectively.

In FIG. 8 and FIG. 9(a), the work file is passed through the calling step 81 of the oven means 11, B2;
Each element of the work file management table 6 of the first and second logical work files is initialized. Records 9111 to 9113 are read by the calling step 83 of the work file input means 13. At this point buffer 9
11 is released and returned as a free area by the buffer area management means. Further, in the calling step 85 of the output means 14 to the work file, the output means 14 to the work file issues a request to secure the buffer area to the buffer area management means 2, and the buffer 911 released just before is again transferred to the second logic. Used as a file buffer.

The state of the buffer area after executing step 84 in FIG. 8 is as shown in FIG. 9(b). After entering this example state, steps 85 and 86 are executed by the work file closing means 12, and the process of FIG. 8 ends.

(Effects of the Invention) As explained above, the present invention frees up buffer area when writing/reading multiple work files like a compiler by releasing multi-buffered buffers during input processing. This has the effect of improving usage efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a work file multiple buffering control method according to the present invention. Figure 2 shows the details of the work file management method shown in Figure 1.
FIG. FIG. 8 is an explanatory diagram showing the contents of the work file management table shown in FIG. 1. FIG. 4 and FIG. 7 are flowcharts showing the processing of the work file oven means, closing means, input means, and output means, respectively. FIG. 8 is an explanatory diagram showing the usage status of the work file management means shown in FIG. 1. FIGS. 9(i) and 9(b) are explanatory diagrams showing the states before and after the transition of the buffer area shown in FIG. 1. 1. Work file management means 2. Management means 3... Physical file input/output means 4... Buffer area S... Φ Physical file 11... Oven means 12... Closing means 13... Input means 14... Output means 21. ... Buffer extraction means 22 ... Buffer return means 90 ... Buffer area 91, 92 - ... Buffer

Claims (1)

[Claims] A buffer area having a finite size, a buffer area management means for alternately extracting necessary buffers from the buffer area and releasing unnecessary buffers, and a buffer area for the physical file functioning as a physical work file. A physical file input/output means for executing input/output processing, and a work file for executing data input/output processing on the buffer without using the physical file when the contents of the buffer area remain. 1. A work file multiple buffering control method, characterized in that it is configured to include a management means.