JPH0738263B2 - Magnetic tape file management device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a magnetic tape file management device, and more particularly to a magnetic tape file management device in an electronic computer system that outputs trace information for debugging or trouble analysis to a magnetic tape.

2. Description of the Related Art Conventionally, in this type of electronic computer system, a processing entity (for example, a utility program) that outputs trace information for debugging and trouble analysis outputs the trace information to a magnetic tape once, and after the debugging is completed, or When a trouble such as system down occurs, the trace information is edited and output from the magnetic tape in which the trace information is stored.

A header label and a trailer label must be written in this magnetic tape file for editing output.

In such a conventional computer system, the processing entity that outputs the trace information when the system is down cannot write the trailer label to the magnetic tape.Therefore, when the system is restarted, the location of the magnetic tape is changed by restarting the job. There is a problem that it is necessary to stop the operation and write the trailer label to the magnetic tape, and when the system restart processing is not necessary like at the end of debugging, it takes extra time and inconvenience. There was a drawback.

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and eliminates the need for the trailer label writing operation that was performed by the restart processing of the processing subject when the system went down, and An object of the present invention is to provide a magnetic tape file management device capable of reducing the development man-hours and capable of editing a magnetic tape storing trace information without restart processing for trailer label writing operation. To do.

The magnetic tape file management device according to the present invention is a magnetic tape file management device for an electronic computer system that writes data to a magnetic tape, and holds in advance whether or not it is necessary to write a trailer label to the magnetic tape. Holding means (7) for holding the trailer label and writing the trailer label by advancing the magnetic tape by the writing amount of the data before writing the data when the content of the holding means requires writing of the trailer label. Control means (5) for controlling,
When the content of the holding means is the writing of the trailer label and the writing of the data is performed by the control means without writing the trailer label, and the content of the holding means is the writing of the trailer label. After the trailer label has been written by the control means, the magnetic tape is rewound to write the data (3, 6).

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, an electronic computer system according to an embodiment of the present invention comprises an electronic computer 1 and a magnetic tape 2. The electronic computer 1 includes a file open processing unit 3, a file close processing unit 4, an automatic magnetic tape trailer label writing processing unit 5, a file writing processing unit 6, and an open file management table 7.

In the open file management table 7, files 8 and automatic trailer label writing necessity 9 are registered.

FIG. 2 is a diagram for explaining the operation of one embodiment of the present invention. In the figure, an arrow a indicates the direction in which the magnetic tape 2 is advanced, and an arrow b indicates the direction in which the magnetic tape 2 is rewound.

The operation of the embodiment of the present invention will be described with reference to FIG. 1 and FIG.

In order for a processing entity (not shown) (such as a utility program) to output trace information, first, the file open processing section 3 requests the file open processing section 3 to open a magnetic tape file. 8 and automatic magnetic tape trailer label writing necessity 9 are registered in the open file management table 7.

Next, although the header label is written to the magnetic tape 2, if it is necessary to write the automatic magnetic tape trailer label 9 designated by the processing subject, the automatic magnetic tape trailer label writing processing unit 5 traces it. Set the output data length of information by adding the length of the header label, request the automatic magnetic tape trailer label writing process, and write the header label to the magnetic tape 2 after the automatic magnetic tape trailer label writing process is completed. Is done.

If the automatic magnetic tape trailer label writing necessity 9 is negative, the header label is written on the magnetic tape 2 without performing the automatic magnetic tape trailer label writing process.

When the processing entity requests the file write processing unit 6 to output the trace information, the file write processing unit 6 outputs the output data length when the automatic magnetic tape trailer label write necessity 9 in the open file management table 7 is required. The length of the trace information is set, the automatic magnetic tape trailer label writing processing unit 5 is requested to perform the automatic magnetic tape trailer label writing processing, and after the automatic magnetic tape trailer label writing processing is completed, the output data ( (Trace information) 21 is written.

If the necessity of writing the automatic magnetic tape trailer label is 9, the output data 21 is written to the magnetic tape 2 without performing the automatic magnetic tape trailer label writing process.

When the automatic magnetic tape trailer label writing processing unit 5 receives a request for automatic magnetic tape trailer label writing processing, the magnetic tape is advanced in the direction of arrow a by the output data length of the trace information, the trailer label 22 is written, and the output data length is written. Then, the magnetic tape 2 is rewound in the direction of arrow b by the trailer label length to set the output data writing start position c.

When the output of the trace information is completed, the processing entity requests the file close processing unit 4 to close the magnetic tape file. When it is necessary to write the automatic magnetic tape trailer label 9 in the open file management table 7 in the file close processing unit 4, since the trailer label 22 has already been written, the trailer label 22 is not written. Automatic magnetic tape trailer label writing necessity 9
If No, the trailer label 22 is written. Finally, the file name 8 and the automatic magnetic tape trailer label writing necessity 9 of the open file management table 7 are deleted regardless of the automatic magnetic tape trailer label writing necessity 9.

As described above, whether or not the automatic magnetic tape trailer label writing is necessary is determined and the automatic magnetic tape trailer label writing process is performed.

In this way, when there is an instruction to write the trailer label 22 to the magnetic tape 2 before writing the trace information (output data 21), the magnetic tape 2 is advanced by the output data length and the trailer label 22 is written. By rewinding the magnetic tape 2 by the amount of the output data length and the length of the trailer label 22 to write the trace information, the trailer which has been performed by the restart processing of the conventional processing main body when the system is down. Since the writing process of the label 22 is not required, it is possible to reduce the development man-hours of each processing entity, and the editing of the magnetic tape 2 in which the trace information is stored without the restart process for writing the trailer label 22. Is possible.

In the embodiment of the present invention, the magnetic tape 2 for trace information is used.
However, it is obvious that the present invention can be applied to the writing of data other than the trace information.

As described above, according to the present invention, when it is instructed to write the trailer label to the magnetic tape before writing the data, the trailer is advanced by the write amount of the data and then the trailer. By writing the label and rewinding the magnetic tape before writing the data, the trailer label writing operation that was performed by the restart processing of the processing subject when the system went down is eliminated, and the processing subject is developed. Can reduce man-hours,
Even if there is no redevelopment processing for writing the trailer label, there is an effect that the magnetic tape storing the trace information can be edited.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram for explaining the operation of the embodiment of the present invention. Explanation of main part code 2 …… Magnetic tape 5 …… Automatic magnetic tape trailer label writing processing unit 7 …… Open file management table 9 …… Automatic magnetic tape trailer label writing necessity

Claims (1)

[Claims] 1. A magnetic tape file management device of an electronic computer system for writing data to a magnetic tape, comprising: holding means for holding in advance whether or not it is necessary to write a trailer label to the magnetic tape; and the holding means. When the content of the trailer label is required to be written, control means for controlling to write the trailer label by advancing the magnetic tape by the write amount of the data before writing the data, and the content of the holding means. When the trailer label is not written, the controller writes the data without writing the trailer label, and the holding means writes the data when the trailer label needs to be written by the controller. Means for rewinding the magnetic tape and writing the data after the trailer label has been written Magnetic tape file management apparatus characterized by having a.