JPH10260852A - Method for holding and reproducing display screen in computer terminal, and computer system realizing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restore an on-like processing, which is executed immediately before the occurrence of a fault, and to continue the subsequent operation, by reproducing a screen image based on a content held in a secondary storage device when the fault occurs and continuing a job. SOLUTION: A terminal equipment 2 is connected to a computer main body 1 through a communication line 3. The terminal equipment 2 has a non-volatile secondary storage device 21, and a screen information recording area is allocated to the secondary storage device 21. When a fault occurs in the terminal equipment 2, the terminal equipment 2 where the fault has occurred, is updated to a state where it cannot be used by a system if the terminal equipment 2 is set to record screen information. Screen information until an input/output instruction for the terminal equipment 2 abnormally terminates is held in the secondary storage device 21 connected to the terminal equipment 2 and the continuation processing of the job can be executed by reproducing screen information held by the secondary storage device 21 from the terminal equipment 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for holding and reproducing a display screen in a computer terminal, and a computer system for realizing the method.

[0002]

2. Description of the Related Art The purpose of a terminal device is to input information on a job constituted by a process executed on a central processing unit (CPU) of a computer main body and to convey the execution result to a computer user. used. The terminal device and the computer main body are connected by a communication line via an input / output control device, and an input / output command is issued by an operating system (OS) that receives a screen input / output request from a process executed on the CPU. An input / output instruction is issued to the terminal device via the input / output control device. The terminal device that has received the input / output command interprets the requested input / output command and executes processing corresponding to the command on the screen of the terminal device.

[0003]

The main processing in a computer is shifting to online processing for instantaneously displaying and responding to the screen of a terminal device. In the above-described conventional system, the following inconvenience occurs when a terminal device failure occurs during online processing. That is, if the online processing of the system itself does not have a function of collecting backup information, the online processing is restarted from the beginning, or an online processing form that can perform recovery processing based on the backup information is generated. Must-have. The present invention has been made in view of the above disadvantages,
It has a function to collect backup information especially for terminal failures that occur when online processing is used via the terminal screen or for local failures such as the line connecting the computer and the terminal. Even in an online processing mode that does not perform, online processing that was being executed until just before the failure occurred can be recovered, and subsequent operations can be continued.
An object of the present invention is to provide a method for holding and reproducing a display screen in a computer terminal, and a computer system for realizing the method.

[0004]

According to the present invention, there is provided a method for holding and reproducing a screen image in a computer terminal. The method comprises the steps of: inputting / outputting data to / from a terminal device connected to a line in response to an input / output request to the terminal device issued from a process executed by a CPU; In a computer system that issues a command and displays a screen according to the issued input / output command, an input / output command issued from a process executed by the CPU to the terminal device starts from the start of the process screen input / output request. The screen image is sequentially stored in the non-volatile secondary storage device, and in the event of a failure, the screen image is reproduced on that terminal device or an alternative terminal device based on the contents stored in the secondary storage device And continue the job. By terminating the process, the input / output instruction held in the secondary storage device is abandoned, so that the screen image is retained in the unit of the input / output request from the process executed by the CPU to the terminal device. When it occurs, it reproduces the retained screen image.

In the computer system of the present invention, at least one terminal device is connected to the computer main unit via a line, and the computer main unit records screen information of a process for performing online processing to the terminal device. Means for adding an information as to whether or not to generate an input / output command,
Means for receiving an input / output instruction, securing a screen information holding area in its own non-volatile secondary storage device when the instruction to record is received, and recording the input / output instruction in the area. Each of the above means holds a screen image in a unit of an input / output request from a process executed in the computer body to a terminal device, and reproduces the held screen image when a failure occurs. The computer checks whether the process is in the screen image recording mode, sets the recording mode for the target terminal in the input / output management area allocated to the main memory, and issues an input / output instruction to the terminal device. The terminal device that has received the input / output command checks the process identification information, stores the command in the screen information recording area of the non-volatile secondary storage device of the terminal device, and notifies the end of the input / output process, It is also characterized in that the target terminal is set in an unusable state.

Thus, the screen information until the input / output command to the terminal device ends abnormally is stored in the secondary storage device connected to the terminal device, and the screen information stored in the secondary storage device from the terminal device is transferred. The reproduction allows the job to be continued.

[0007]

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

In FIG. 1, reference numeral 1 denotes a computer main body, which comprises a central processing unit (CPU) 11, a main storage device 12, and an input / output control device 13, and is commonly connected to the computer main body 1 via a system bus 14. In the main storage device 12, a terminal input / output management area 121 in which status information is generated and recorded for each terminal and process, and an environment area 122 in which a terminal environment used at the time of process execution is set are allocated and stored. You. Details of each area will be described later. Reference numeral 2 denotes a terminal device, and a plurality of terminal devices (2-1 to 2-n)
Is connected to the computer main body 1 via the. The terminal device 2 has a nonvolatile secondary storage device 21, and the secondary storage device 21
Inside, a screen information recording area (history) is allocated and stored.

Hereinafter, a method of recording screen information of a terminal device to which online processing is assigned while online processing is being executed on a computer will be described. In the online processing, a message prompting the user and prompting an input operation is displayed at the start of the processing. At this time, the process responsible for the online processing issues a message input / output request to the OS. OS that received the message input / output request
Then, an instruction is created for the terminal device 2 displaying the message, and this instruction is issued to the terminal device 2 via the input / output control device 13.

[0010] Whether or not to record the screen information of the process responsible for the online processing in the terminal device 2 can be designated in process units, and in response to a message input / output request from the designated process for recording the screen information in the terminal device 2. In other words, when creating an input / output command issued to the terminal device 2 by the OS that has received the input / output request, the message is created in a format to which information that can identify the process that issued the message input / output request is added. Information for identifying a process is not added to a message input / output request from a designated process that does not record screen information in the terminal device 2.

When an instruction to which information for identifying a process is added is issued to the terminal device 2 via the input / output control device 13, the terminal device 2 stores the screen information in the built-in secondary storage device 21 in process units. A history area is secured, and input / output instructions are recorded in that area. In the case of a command waiting for a user to input a message, the input data is converted into a command to be output to the terminal device 2 and recorded.

Similarly, when a command to the terminal device 2 is created in response to a message input / output request from the OS, the terminal device 2 that issues the message input / output command executes the process when the setting for recording the screen information is made. Identifiable information is added.

FIG. 2 shows that the terminal device 2 has a screen information recording area 2.
1 is a flowchart illustrating a recording method when a failure occurs in the terminal device 2 while updating the content of the information No. 1. When a failure occurs in the terminal device 2, the OS and the terminal device 2 perform the following processing according to the state of the online processing when the failure occurs. That is, when the online processing is waiting for the user to input / output data, the process responsible for the online processing is waiting for the input / output processing end notification from the OS. When the OS is notified of an end interrupt of an error relating to an input / output command issued to the terminal device 2 due to the terminal device failure, if the terminal device is set to record screen information, the OS terminates the failed terminal device 2 The system is updated to a state where it cannot be used, and the end interrupt is not notified to the process that is responsible for the online processing, and the process is left in a state of waiting for the input / output processing end notification.

When a process that is responsible for online processing is performing CPU processing or input / output processing to / from the secondary storage device 21, execution continues until an input / output request is issued to the terminal device 2. When an input / output request to the terminal device 2 is issued to the terminal device 2, an input / output command to the terminal device 2 is not issued and the input / output is waited for, and the same processing as the former is performed.

When the failed terminal device 2 is restored or a substitute for the failed terminal device 2 can be prepared, and the user presses a key for restoring the screen on the terminal device 2, the terminal device 2 The input / output command is executed from the screen information storage area related to the online processing stored in the secondary storage device 21 to reproduce the screen at the time of occurrence of the terminal failure. When the reproduction of the screen is completed, the terminal device 2 generates an attention including information for identifying the process. The OS that has received the attention re-executes an input / output request at the time of occurrence of a terminal failure for a process waiting for an input / output processing end notification at the time of a terminal failure.

At this time, if the input / output command is re-executed to another terminal device 2 (21-n) other than the one recording the screen information, the terminal device used at the time of the failure is released, and The terminal device environment assigned to the process is updated to the substituted terminal device 2 (21-n), the terminal device identification information in the command to be re-executed is edited, and then the input / output command is executed.

At this point, the state at the time of occurrence of the failure in the terminal device 2 has been restored, and the user can resume the operation from the state immediately before the occurrence of the failure in the terminal device 2. FIG. 3 is a flowchart showing the process related to the terminal device state restoration.

[0018]

As described above, according to the present invention, a terminal device failure that occurs when online processing is used via the terminal device screen, or a local failure such as a line connecting the computer and the terminal device. In response to the occurrence, even in an online processing mode that does not have a function to collect backup information, the online processing that was being executed until immediately before the failure occurred can be recovered and the subsequent operations can be continued. The present invention provides or constructs a holding / reproducing method and a computer system for realizing the method, and further has the following effects.

(1) The latest screen state in which an input / output request has been normally completed is reproduced by holding an input / output command issued to the terminal device by the computer main body in a secondary storage device connected to the terminal device. It is possible to do. Therefore, if a failure occurs in the terminal device or the line connecting the terminal device and the computer, when the failure that occurred in the terminal device is restored, the screen up to the failure is reproduced, and the failed input / output command is re-executed. By executing, it becomes possible to continue without re-executing the online processing due to the failure of the terminal device.

(2) A secondary storage device in which the group of input / output instructions held by the method of holding a screen image of a computer terminal device is recorded is mounted on a terminal device different from the terminal device that executed the group of input / output instructions. By doing so, when a failure occurs in the terminal device or a line connecting the terminal device and the computer main body, the processing can be replaced by the terminal device.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Computer main body, 2 (2-1-2-n) ... Terminal device, 3 ... Communication line, 11 ... Central processing unit (CPU), 12 ... Main storage device, 13 ... Input / output control device, 14 ... System bus , 2
1 ... Secondary storage device (screen information recording area), 121 ... Terminal input / output management area, 122 ... Terminal environment area at the time of process execution.

Claims (8)

[Claims] 1. A computer system for issuing an input / output command to a terminal device connected to a line in accordance with an input / output request to a terminal device issued from a process executed by a CPU, and displaying a screen in accordance with the issued input / output command. An input / output command issued from the process executed by the CPU to the terminal device is sequentially held in a non-volatile secondary storage device of the terminal device starting from the start of the screen input / output request of the process,
A method for retaining and reproducing a display screen in a computer terminal, characterized in that when a failure occurs, a screen image is reproduced based on the contents stored in the secondary storage device and the job is continued. 2. When the process is terminated, the I / O instructions held in the secondary storage device are discarded.
3. The computer terminal according to claim 2, wherein a screen image is held for each input / output request from a process executed by the CPU to the terminal device, and the held screen image is reproduced when a failure occurs. How to maintain and reproduce the display screen. 3. At least one terminal device is connected to the computer main unit via a line, and the computer main unit adds information on whether or not to record screen information of a process for performing online processing to the terminal device. The terminal device receives the input / output command and creates a screen information holding area on a non-volatile secondary storage device of the terminal device when receiving the input / output command. And means for recording an input / output command in the area.
A computer system characterized in that it retains a screen image for each input / output request from a process executed by a computer to a terminal device and reproduces the retained screen image when a failure occurs. . 4. The computer main body checks whether or not the process is in a screen image recording mode, sets the recording mode in the target terminal of the input / output management area allocated to the main memory, and enters the terminal device. The terminal device that has issued the output command and received the input / output command checks the process identification information, stores the command in the screen information recording area of the secondary storage device of the terminal device, and notifies the end of the input / output process. 4. The computer system according to claim 3, wherein the target terminal is set to an unusable state. 5. The terminal device recovers a terminal in which a failure has occurred,
Or, when the alternative terminal is ready, execute the input / output instruction recorded in the non-volatile memory to reproduce the screen contents, issue an attention that can identify the process, and receive the 5. The computer system according to claim 4, wherein an input / output request at the time of occurrence of a terminal failure is re-executed for a process which waits for an input / output processing end notification. 6. When a re-execution of an input / output command is instructed to a terminal device different from the terminal device recording the screen information, the terminal device used at the time of the failure is released and assigned to the process. 6. The computer system according to claim 5, wherein the terminal device environment is updated to the substituted terminal device. 7. An information processing system for issuing an input / output command to a terminal device connected to a line in accordance with an input / output request to a terminal device issued from a process executed by a CPU, and displaying a screen in accordance with the issued input / output command. In the CP
An input / output command issued from the process executed in U to the terminal device is sequentially held in a secondary storage device of the terminal device starting from the start of the screen input / output request of the process. A method for retaining and reproducing a display screen in a computer terminal, wherein the content retained in the computer terminal is reproduced on another alternative terminal device. 8. When the process is terminated, the input / output instruction held in the non-volatile memory is discarded, so that the screen image in units of an input / output request from the process executed by the CPU to the terminal device is displayed. Hold, in case of failure,
8. The method according to claim 7, wherein the held screen image is reproduced by another alternative terminal device.