JPH04338852A - File transfer program with interruption restart mechanism - Google Patents

Abstract

PURPOSE:To reduce the occupied area of a memory by making a file transfer program transient and deleting used file information in a file control memory. CONSTITUTION:A file transfer mechanism 12 which transfers a file from a terminal controller to a terminal equipment and a task start processing mechanism 11 which performs the open processing of the file to be transferred before the start of transfer are provided. When receiving a file transfer program stop command, an interruption processing mechanism 22 records the control state of the file to be transferred in a file control information table 18 and records control information of the terminal equipment in a terminal control information table 13 and interrupts transfer. A restart processing mechanism 21 refers to the table 18 and the table 13 to restart transfer of the file, and used information in the table 18 is deleted by an aria management function 24.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file transfer program having an interrupt/resume mechanism used in a terminal controller for transferring files between a terminal controller and a terminal device.

[0002] In recent years, with the demand for higher functionality and lighter weight computer systems, there has been a demand for shorter file transfer times between a terminal controller (hereinafter abbreviated as TC) and multiple terminal devices (hereinafter abbreviated as WS). ing. Furthermore, due to the diversification of processing between TC and WS,
The need for memory sharing due to multiple programming is also increasing.

0003

2. Description of the Related Art In conventional file transfer systems, a file transfer program and other business programs exist simultaneously as resident programs, occupying a large amount of memory in a TC. FIG. 5 is a block diagram of a conventional file transfer program. In the figure, 14 is an operating system that controls the TC, 11 is a task start processing mechanism that opens the file to be transferred at the start of transfer by the file transfer program 15, and 12 is the TC and WS.
13 is information related to WS control (information such as the name of the file to be transferred, connected line number, transfer mode, path name, etc.);
This is a terminal control information table that stores information, and has an area divided for each WS. 18 is a file control information table that records the control status of the file to be transferred (file name, file size, amount of data transferred, file status, etc.), and has an area divided for each opened file. . , 15 is a file transfer program that includes a task start processing mechanism 11, a file transfer mechanism 12, and a terminal control information table 13, and performs file transfer between the TC and the WS. Further, FIG. 6 is a basic operation flowchart of a conventional file transfer program. The operation will be explained according to the diagram.

[0004] When a file transfer request is received from the WS in step 70, the terminal control information table 1 is transferred in step 71.
The name of the WS file is extracted from 3, and the file status is extracted from the file control information table 18. In step 72, the file name is designated and the task start processing mechanism 11 is activated. In step 73, a buffer in the TC is acquired and the specified file is opened. Step 7
4, the file transfer mechanism 12 is activated and executed between the TC and the WS. When the file transfer is completed in step 75, T
Close the C file. In step 76, the end of file transfer is sent to the WS.

[0005] As described above, there is no problem when the program exists in the TC's memory, but if the file transfer program is deleted from the memory due to the execution of another program, the file transfer program that was previously used to transfer It was impossible to restart after an interruption because all the management information that had been created would be lost. Therefore, the file transfer program had to be made a resident program.

[0006]

As mentioned above, there is a problem in that the file transfer program becomes resident and occupies memory.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a means for reducing the occupied memory area by making a file transfer program non-resident and deleting used file information in a file control memory.

[0008]

[Means for Solving the Problems] The above problems are solved by a file transfer program having an interrupt/resume mechanism configured as follows. FIG. 1 is a diagram showing the principle of the present invention.

At least a file transfer mechanism 1 for transferring a file from a host to a terminal controller and transferring the file from the terminal controller to a terminal device.
2, a task start processing mechanism 11 that performs open processing of the file to be transferred before starting the transfer, a terminal control information table 13 that records control information of the terminal device, and a file control that records the control state of the file to be transferred. In a file transfer program that has an information table 18 and operates within a terminal controller that transfers files from a terminal controller to a terminal device, an area management function 24 that erases used information from the file control information table 18; an interruption processing mechanism 22 that records the control state of the file to be transferred in the file control information table 18 and records the control information of the terminal device in the terminal control information table 13 to interrupt the transfer when receiving a command to cancel the transfer program; By providing a restart processing mechanism 21 that resumes transfer by referring to the file control information table 18 and the terminal control information table 13, the control state of the file is stored in the file control information table 18 at the time of interruption, and the control information of the terminal device is is stored in the terminal control information table 13, and when the file transfer program is restarted, the file control information table 18 and the terminal control information table 13 are referenced to obtain information on the file to be continuously used and the transfer is restarted. , a file transfer program having an interrupt/resume mechanism characterized by erasing used information of an area of the file control information table 18.

0010

[Operation] When the interruption processing mechanism 22 receives a command to cancel the file transfer program, it records the control status of the file to be transferred in the file control information table 18 and the control information of the terminal device in the terminal control information table 13. to interrupt the transfer.

The restart processing mechanism 21 refers to the file control information table 18 and the terminal control information table 13 and resumes file transfer. The area management function 24 erases the used information in the file control information table 18.

0012

Embodiment FIG. 2 is a block diagram of a file transfer program according to an embodiment of the present invention. In the figure, 16 is another program that operates in place of the file transfer program under the operating system (OS), and 17 is the OS.
This is a terminal control information table save area in which the terminal control information table 13 in the program is saved, and is prepared for each terminal. 21 is the file control information table 18
and the terminal control information table 13, the restart processing mechanism 22 resumes file transfer, records the control state of the file to be transferred in the file control information table 18,
An interruption processing mechanism records the control information of the terminal device in the terminal control information table 13 and interrupts the transfer. Reference numeral 24 is a file status flag indicating whether the file recorded in the file control information table 18 is open. Other components having the same reference numerals as those in FIG. 5 are the same.

FIG. 3 is a flowchart of a file transfer program according to an embodiment of the present invention. The operation will be explained according to the diagram. When the program is started, the restart processing function is entered, and in step 81, the file control information table 18 is referred to to check whether the file status flag 25 regarding the file designated for transfer exists. If it exists, step 83 indicates that it does not exist, then the process proceeds to step 82. In step 83, the file status flag 25 regarding the specified file is checked to determine whether the file is open. If the file is not open, the process advances to step 84.

[0014] If the file is open, it is determined that the interrupted file transfer is to be resumed, and
All the information in the file control information table 18 is referred to and the process proceeds to step 85. Steps 81 to 83 constitute a restart processing mechanism.

If the file status flag 25 does not exist, it is determined that the file transfer program is restarting after being interrupted, and in step 82 the contents of the terminal control information table are saved from the terminal control information table save area 17 of the OS 14. In order to copy and restore the file to the terminal control information table 13 and open the specified file, step 8
Proceed to step 4. In step 84, the task start processing mechanism 11 is started to perform open processing on the specified file, and the corresponding file status flag is set to open.

At step 85, the file transfer mechanism 12 is activated to resume transfer of the designated file. If the file transfer is interrupted in step 86, the process proceeds to step 88. When the cancellation command is received in step 88, the terminal information and file name in the terminal control information table 13 are saved in the terminal control information table save area 17 of the OS 14 in step 89, and the file status flag is saved in the file control information table 18 in step 90. 25 is evacuated. The opened file is closed in step 91 and the process ends. Steps 88-91 constitute an interruption handling mechanism.

Further, if the file transfer is completed without interruption in step 87, the file transfer program is terminated. The file transfer program is started again, and when a transfer command is received, the specified file is transferred. Also, other programs are started and executed. Its control is OS1
4 will do it.

FIG. 4 is a diagram showing the state transition of the file control information table, and is a diagram for explaining the function of the area management mechanism. (1) in the figure shows the state of the file control information table 18 when the first file is being transferred. File status 1 corresponding to the first file
Only exists. (2) shows the state of the file control information table 18 when a second file transfer request is made during the first file transfer. There is a file state 1 corresponding to the first file and a file state 2 corresponding to the second file. (3) shows the state of the file control information table 18 when a third file transfer request is made during transfer of the first file and the second file. There are file state 1 corresponding to the first file, file state 2 corresponding to the second file, and file state 3 corresponding to the third file. (4) indicates the state when the transfer of the first file is completed while the second and third files are being transferred. Only file state 2 and file state 3 corresponding to the second file and the third file exist. An area management mechanism is provided to effectively utilize memory areas by erasing information that has been used in this way. (5) shows the state of the file control information table 18 when a request to transfer the fourth file is made during transfer of the second file and the third file. File state 2 corresponding to the second file, File state 3 corresponding to the third file, and File state 4 corresponding to the fourth file.
exists. An area management mechanism is provided to erase information that has been used in this manner and record information for the next file.

As explained above, by adding an interruption processing function and a restart processing function to a file transfer program, the area is By adding a management function and erasing used file control information, it is possible to provide a file transfer program that occupies a small area.

[0020]

As is clear from the above description, the present invention has a remarkable industrial effect in that it is possible to provide a file transfer program that is a non-resident program but has the functions of a resident program and occupies a small area.

[Brief explanation of drawings]

[Figure 1] Principle diagram of the present invention

[Figure 2] Configuration diagram of a file transfer program according to an embodiment of the present invention

[Figure 3] Flowchart of the file transfer program according to the embodiment of the present invention

[Figure 4] Diagram showing state transition of file control information table

[Figure 5] Configuration diagram of a conventional file transfer program

[
Figure 6: Basic operation flowchart of a conventional file transfer program

[Explanation of symbols]

11 Task start processing mechanism 12
File transfer mechanism 13 Terminal control information table 14 Operating system 15 File transfer program 16 Other programs 17 Terminal control information table save area 18 File control information table 21 Resumption processing mechanism 2
2 Interruption processing mechanism 24 Area management mechanism
25 File status flag

Claims (1)

[Claims] Claim 1: At least a file transfer mechanism (12) that transfers a file from a host to a terminal controller, and transfers the file from the terminal controller to a terminal device, and an open process for the file to be transferred before starting the transfer. A task start processing mechanism (11) and a terminal control information table (1) that records control information of the terminal device.
3) and a file control information table (18) that records the control state of the file to be transferred, and in a file transfer program running in a terminal controller that transfers a file to a terminal controller terminal device, the file control information is An area management function (24) that erases used information in the table (18) and a control state of the file to be transferred when receiving a command to cancel the file transfer program are recorded in the file control information table (18). Terminal control information table (13)
An interruption processing mechanism (22) that interrupts the transfer by recording the data in the file control information table (18) and a restart processing mechanism (21) that resumes the transfer by referring to the file control information table (18) and the terminal control information table (13) are provided. At the time of interruption, the control status of the file is stored in the file control information table (18), the control information of the terminal device is stored in the terminal control information table (13),
When the file transfer program is restarted, the file control information table (18) and the terminal control information table (13)
A file transfer having an interruption/resuming mechanism characterized in that the information on the file to be continuously used is obtained by referring to the information, the transfer is restarted, and the used information in the area of the file control information table (18) is erased. program.