JPS61141063A - Suspension resumption system of file transfer - Google Patents

Abstract

PURPOSE:To attain emergent interruption by preparing suspending and resuming commands, suspending file transfer processing at the next point when the suspending command is inputted and resuming the transfer by means of the resuming command upon the completion of interruption processing. CONSTITUTION:Suspending and resuming commands such as 'SUSPEND', 'RESUME', etc., are prepared, and the file transfer processing is provisionally suspended at the next checking point when the suspending command is inputted. At this time the suspended section is made receptive of a new request. When the resuming command is inputted upon the completion of the interruption processing, the transfer of the suspended file is resumed. The resumption of the suspension can be made any time during transferring one file.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a file transfer interrupt/restart method that enables emergency interrupts and divided file transfer by providing a file transfer means with an interrupt/restart function. It is.

[Prior art and problems]

FIG. 10 is a diagram showing an example of a file transfer method, and FIG. 11 is a diagram explaining conventional file transfer. In FIG. 1θ, ■ indicates a host computer, 2 indicates a terminal, 3 and 4 indicate file transfer means, and 5 and 6 indicate files, respectively.

Note that although only one terminal is shown in the figure, there are actually multiple terminals. If the user of terminal 2 wants to transfer the data of file 6 to file 5, 5END
FILE(6) TOFILE(5) 5TATION
For example, input the command 1 from the keyboard.

Then, the file transfer means 4 of the terminal 2 sends a file transmission request to the host computer 1, the file transfer means 3 of the host computer 1 returns a response to the file transmission request, and then sends a block group request. Upon receiving the block group request, the file transfer means 4 of the terminal 2 sequentially sends n data blocks. When n data blocks are received, check point processing is performed to check whether all n data blocks have been received normally.

Assuming that the data transfer is successful, information indicating how far has been sent is written to the session service table on the sending side, and information indicating how far has been received is written to the session service table on the receiving side. . Such n data block transfers are performed multiple times, and all data in file 6 is transferred to file 5.

All data in file 6 is also transferred to file 5 when the user of host computer 1 inputs a RECEIVE command. Of course, it is also possible for the file transfer means 3 of the host computer 1 to issue a file transmission request, and it is also possible for the file transfer means 4 of the terminal 2 to issue a file reception request. The session service table stores information such as the transfer source and destination file names, pointers that indicate how far in the file has been transferred or written, and the number of data blocks that make up the block group. has been done.

In conventional file transfer, once the transfer is started, the session is occupied until the transfer is completed or canceled, resulting in the following problems.

That is, even if an urgent request such as a message transmission or a small but highly urgent file transfer occurs during a large file transfer, the request cannot be interrupted, which hinders effective business execution. It is effective to transfer large files by dividing them into periods of low load (multiple times), but this operation is not possible.

[Purpose of the invention]

The present invention is based on the above consideration, and an object of the present invention is to provide a file transfer suspending/resuming method in which a file transfer means is provided with a suspending/resuming function and an emergency interrupt is possible.

[Means to achieve a goal].

Therefore, the file transfer interruption/resumption method of the present invention is equipped with a host computer and a plurality of terminals, and is capable of transferring data from a file on the host computer to a file on the terminal or from a file on the terminal to a file on the host computer. In this system, when a suspend command is input, the file transfer means of the host computer sends a suspend request to the receiving terminal after plotter group transfer is completed, and The device is configured to interrupt file transfer and wait for the next new service request, and to perform processing to resume the interrupted file transfer when a resume command is input, and the file transfer means of the terminal is configured to When input, a suspension request is sent to the above host computer after the block group transfer is completed, the file transfer is suspended and the next new service request is waited for, and when a restart command is input, the suspended file is The present invention is characterized in that it is configured to perform processing for restarting transfer.

[Embodiments of the invention]

In summary, the present invention is as follows.

For example, suspend and resume commands such as 5USPEND and RHSIIMB are prepared. When the interrupt command is input, the file transfer process is temporarily interrupted at the next check point. The canceled session can accept new requests. When the restart command is input when the interrupt processing is completed, the suspended file transfer will be resumed.

Interruption and resumption may be performed any number of times during one file transfer.

FIG. 1(a) is a diagram showing an outline of processing when the file transfer means on the sending side sends an interruption request.

When an interrupt command is input from a keyboard or the like, an interrupt request display is turned on. The interrupt command is, for example, 5USPE
ND FILE(A) To FILf! (B) 5T
It's called AT Summer ON X. data block 1
If n is transferred, the sender performs checkpoint processing. During this check point processing, conventional check point processing is performed and it is checked whether the interrupt request display is on. If it is on, the sending side sends an interruption request to the receiving side, and when a response is received, it performs processing for the next new service. - Figure 1 fb) is the file transfer on the receiving side. FIG. 6 is a diagram illustrating an overview of processing when the means transmits an interruption request.

When the receiving side receives data blocks 1 to n,
During check point processing, it is checked whether the interrupt request display is on or not. If it is on, it sends an interrupt request to the sender and waits for a response. If a response is returned, processing for the new service is performed.

FIG. 2 (al) is a diagram showing an outline of processing when the file transfer means on the sending side sends a restart request.

When a resume command is input from the keyboard, the sending side sends a restart request to the receiving side, and if a response is received, it waits for a block group request to be sent).

The restart command is, for example, REST1Mt! FILt!
(A) To FILE (8) 5TATION X. When a block group request is sent, data block transmission begins.

FIG. 2 (bl is a diagram showing an outline of the process when the file transfer means on the receiving side sends a restart request.

When a resume command is input, the receiver sends a resume request to the sender, waits for a response, and if a response is received, sends a block request to the sender, and then Receive incoming data blocks.

FIG. 3 is a diagram showing the processing when an interrupt command is input from the keyboard. When the host computer 1 and the terminal receive the interrupt command, they perform the following processing.

■ Check the validity of the interrupt command.

■ Place an abort request indication in the corresponding session service table.

FIG. 4 is a diagram showing the process when the file transfer means on the sending side sends an interruption request.

■ Check whether the data block you are about to send is the nth one. If Yes, perform the process (■).

■ Check to see if there is an indication of a suspend request. If Yes, process (2) is performed.

■ Send the nth data block without sending rights delegation. It should be noted that the term "transmission right entitlement" means granting the other party the right to transmit data.

■ Send an interruption request.

■ Receive a response.

FIG. 5 is a diagram showing a process when the file transfer means on the receiving side sends an interruption request.

■ Check whether the nth data block has been received. If Yes, perform the process (■).

■ Check to see if there is an indication of a suspend request. If Yes, process (2) is performed, and if No, a block group request is transmitted.

■ Send an interruption request.

■ Receive a response.

FIG. 6 is a diagram showing a process when the file transfer means on the sending side receives an interruption request during file transfer. -゛■ Check whether the request sent from the receiving side is an interruption request. If Yes, perform the process of ■.

■ Send a response.

FIG. 7 is a diagram showing a process when the file transfer means sending means receives an interruption request.

■ Check whether transmission right has been delegated to the received data block (nth). If Yes, perform the process (■).

■ Receive an interruption request.

■ Send a response.

FIG. 8 is a diagram showing restart processing.・■ Check the validity of the restart command.

■ Search the corresponding session service table.

■ Send a restart request.

■ Receive a response.

FIG. 9 is a diagram showing the processing when the file transfer means receives a restart request.

■ Receive a restart request.

■ Send a response.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to schedule file transfers and related tasks according to priorities.

[Brief explanation of drawings]

Figure 1 is a diagram showing an overview of the process when the file transfer means sends a suspension request, Figure 2 is a diagram showing an overview of the process when the file transfer means sends a restart request, and Figure 3 is a diagram showing the outline of the process when the file transfer means sends a restart request. Figure 4 is a diagram showing the processing when the file transfer means on the sending side sends an interruption request, and Figure 5 is a diagram showing the processing when the file transfer means on the receiving side sends an interruption request. A diagram showing the processing when sending,
Figure 6 is a diagram showing the process when the sending side file transfer means receives an interruption request during file transfer, and Figure 7 is the process when the receiving side file transfer means receives an interruption request during file transfer. , FIG. 8 is a diagram showing restart processing, FIG. 9 is a diagram showing processing when the file transfer means receives a restart request, FIG. 10 is a diagram showing an example of a file transfer method, and FIG. The figure is a diagram explaining conventional file transfer. 1...Host computer, 2...Terminal, 3 and 4...File transfer means, 5 and 6...File.

Claims (1)

[Claims] A method for suspending and resuming file transfer in a system that is equipped with a host computer and a plurality of terminals and can transfer data from a file on the host computer to a file on the terminal or from a file on the terminal to a file on the host computer. , when the above-mentioned file transfer means of the host computer receives the interrupt command, it sends an interrupt request to the receiving terminal after the block group transfer is completed, interrupts the file transfer, and waits for the next new service request. In addition, the device is configured to perform processing for restarting the suspended file transfer when the resume command is input, and the file transfer means of the terminal is configured to resume the suspended file transfer after the block group transfer is completed when the suspend command is input. It is configured to send a request to the host computer, suspend the file transfer, wait for the next new service request, and perform processing to restart the suspended file transfer when a restart command is input. A method for suspending and resuming file transfers.