JPH02268323A - Computer system - Google Patents

Abstract

PURPOSE:To restart display without hindrance by generating a drawing display forcible termination code to terminate the display request of a task executing processor at the time of restart of a display processor and executing display of display information by the display processor. CONSTITUTION:After abnormality occurs in a processor 4 for management and display, window management information in a memory 4a on the processor 4 is cleared and is set to the initial state, and a picture clear code of a key 'C' is sent from the processor 4 to a display request processor 3, and the display of windows A and B requested at present is stopped. Thereafter, a key 'A' is depressed, and corresponding window and data are displayed. Consequently, the window management processing is executed from the first after restart of the processor 4; and therefore, confusion due to loss of management information on the way of processing is prevented and the display request after restart is normally accepted to normally display data.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Application Field) The present invention relates to a computer system comprising a plurality of processors. The present invention relates to a computer system that manages a display window and improves the recovery method of a processor that controls display in a computer system configured to perform display in response to a display request from a processor.

(Prior Art) Computers generally have an operating system (O8
) or execute various tasks under the control of a monitor, among which multiple processors (CPLI) are provided,
A specific one of them is made to manage the display window and control the display on the display, and the other processors are made to execute their respective tasks, and respond to display requests for the execution tasks. , the processor for window management/display control (hereinafter referred to as management/display control processor)
There is a system in which information requested for display is displayed in a window to be displayed by the task using a display processor (referred to as a display processor).

In the processor that manages and displays such display windows, software may run out of control.
If the watchdog timer is activated, reset, and restarted, the window management information will be initialized, so the connection with the display request processor that was displaying up until now will be severed, and the display request processor will no longer be able to display the information. Display information cannot be displayed in the desired window. Therefore,
Since normal display is no longer possible, subsequent display operations cannot be performed successfully even after restarting. In systems like this that display various information on a display for monitoring, window management and
Management/display processor responsible for display control (
If the CPU) is forcibly initialized midway through,
The display becomes confusing and monitoring becomes impossible.
This is a serious problem in systems that monitor the operating status of plants and issue commands.

(Problem to be Solved by the Invention) As described above, a plurality of processors (CPUs) are provided, and a specific one of them is made to manage the display window and control the display on the display, and The other processors are caused to execute their respective tasks, and in response to the display request of the executed task, the display control processor controls the display information provided by each task to be displayed in the window corresponding to the task. In a system that manages and displays display windows, the management/display processor is responsible for displaying in response to display requests while running its own management/display control software. However, if a predetermined routine is not executed for a certain period of time due to software runaway of the management/display processor, a watchdog timer is activated, and the system is automatically reset and restarted. When such a restart is performed, window management information will be initialized in the display control processor, making it impossible to display information in the corresponding window based on previous display requests. It ends up. In other words, when restarting, subsequent display operations are no longer related to the display requests made before the restart, so information based on the display requests made before the restart is no longer displayed, and display information input after that should be displayed. The window cannot be determined and cannot be displayed, or the window may be displayed in an appropriate display position one after another, resulting in a disordered display.

In a system where window management and display control are performed by a display processor, if the display processor is initialized during a display request, display control becomes impossible, and the display is used to control plant operations, etc. In systems that perform monitoring, commands, etc., there is a problem in that monitoring becomes impossible because normal display cannot be performed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a system in which a separate display processor is provided to manage windows in which input display information is to be displayed and to control the display on the display. To provide a computer system that can respond to display requests without any trouble even if the computer is restarted.

[Configuration of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows. That is, in response to a display request from a processor for executing a task, a display control processor is provided to manage the window so that the display information from the processor that requested the display is displayed in the window to be displayed, and to display it on the display means. In the computer φ system, the task execution processor is configured to have a function of terminating the display request upon receiving a screen display forced termination code, and the display control processor has its own function when restarting. It is configured to have a function of performing initialization and sending the screen display forced termination code to the task execution processor.

(Function) In such a configuration, when the display processor is restarted, a screen display forced termination code is generated and given to the task execution processor. Since the task execution processor has the function of terminating the display request using this code, it immediately terminates the display request and moves on to the next execution. Then, at the stage of displaying information, a display request is issued again and given to the display processor, so the display processor manages the window used for displaying the task at this stage.
Displays display information. Therefore, after restarting the display processor, both the display processor and the task line processor will start the necessary display processing from the beginning at the stage of displaying information, and will be able to display the specified display without any problems. becomes possible to execute.

By doing this, even if the processor that manages windows and displays the display is restarted due to an error, the display can be resumed without any problems after the restart, just as if the screen had been cleared. Therefore, even if the display control program starts operating in the initial state, it will be able to correctly accept subsequent display requests.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. What FIG. 1 shows is the normal display state.

1 is a bus that connects the CPUs, 2 is a keyboard, and 3 is a processor (CPU) for executing tasks; here, the processor that issues a display request is shown. 4 is a management/display processor, which handles window management and display (CRT, etc.)
This is the CPU that controls the display on the . 5 is a display whose display is controlled by this management/display processor 4, and 4a is a memory for storing window management information in the management/display processor 4. When the management/display processor 4 receives a display request from the processor 3, the management/display processor 4 stores the management information in the memory 4a to display it in the window allocated for displaying the display information in the execution task of the processor 3. Control is performed to display on the display 5 based on the management information.

In addition, the keyboard 2 is equipped with a screen clear key as one of the keys for switching the screen on the display 5. When this screen clear key is pressed, all the contents displayed on the display 5 are cleared and nothing is displayed. You can make it work so that it doesn't. To this end, the keyboard 2 generates a screen clear key code when the screen clear key is pressed.

When this screen clear key code is input, the processor 3 that makes the display request outputs the screen clear code CDI to the management red display processor 4, and the management/display processor 4 then clears the screen of the display 5. This is a configuration that controls to clear the . In addition, the management/display processor 4 includes a screen clear code C when restarting.
The configuration is such that a DI is generated and given to the processor 3, and the processor 3 includes a screen clear key code CD.
A display request termination routine is created in which, upon receiving I, the display request operation is terminated and the display request process is restarted from the beginning at the next display request.

In such a configuration, when the operator presses the processing key "A" on the keyboard 2 during normal display, as shown in FIG. 2(a), the display request processor 3
In response to this, it requests the management/display processor 4, which performs window management and display control, to create a display window for the task of the display request processor 3. Then, the display request processor 3 requests the display of the data of the window contents. As a result, the management conflict display processor 4 executes creation of a display window for the task of the display request processor 3, creates window management information on the memory 4a, and uses this information to determine the designated position on the screen of the display 5. control the display of data. Similarly, when the processing key "B" on the keyboard 2 is pressed, the corresponding window management is performed by the management/display processor 4, i.e., the window "B" is pressed.
The management information of o is stored in the memory 4 on the management/display processor 4.
a, and the data to be displayed is displayed on the screen of the display 5 based on this. C on the keyboard 2 is a screen clear key, and when this key is pressed, the management/display processor 4 clears the display information on the memory 4a and erases the information displayed on the screen.

FIG. 2(b) shows the state when the window management/display processor 4 becomes abnormal. Although the memory 4a on the management/display processor 4 contains management information for windows "A" and "B", the display 5 either does not display it, or the display is confused, or the contents are not updated. will no longer be done.

FIG. 2C shows the state when the window management/display processor 4 is restarted by the watchdog timer function after an abnormality occurs. Management/display processor 4
The window management information in the upper memory 4a is cleared and becomes the initial state, and at the same time, the key code for the key "C#," that is, the screen clear code CDI, is sent from the management/display processor 4 to the display request processor 3. When the key code CDI is received, it operates as if the key "C" on the keyboard was operated and the key code for key "C" was sent, and the display of windows A and B that are currently requesting display is stopped. do.

FIG. 2(d) shows a state in which the key "A" is then pressed and the corresponding window and data are displayed, and the window management information in the memory 4a on the management/display processor 4 is stored under the key "A". .

The corresponding window "A" is placed.

In this way, this system consists of multiple processors,
Among these, in a system in which one processor has the function of managing the window of the display means and receives output requests from other processors and displays the data in the window, the function for managing and displaying the display window is When the processor is restarted due to an error, the processor, excluding the processor for displaying window management conflicts, is used to notify other processors that the window management information held within the processor has been cleared by the restart.
A code for terminating the screen display request is given to the other processor, and each of the other processors is provided with a function of executing an operation for terminating the screen display request upon receiving the code. . and,
When the window management/display processor restarts due to an error, it generates a code to terminate the screen display request and sends it to the other processors mentioned above, so if the window management/display processor restarts due to an error, When restarted, it initializes itself, and also causes other processors to finish information display commands based on display requests,
Since window management and display are executed from the beginning the next time a display request occurs, even if the window management red display processor is restarted, the window management process will be executed from the beginning after restarting. This eliminates confusion caused by loss of management information midway through the process.
Display requests after restarting are normally accepted and can be displayed normally.

The present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within the scope of the gist.For example, in the above embodiments, the end of the display request is determined by clearing the screen. Although the code is used, other control codes may of course be used, and the display means is not limited to CRT, but other electronically controllable display means such as a plasma display or a liquid crystal display can be used.

[Effects of the Invention] As described above, according to the present invention, even if the management/display processor that manages windows and displays on the display is restarted due to an abnormality, the screen clearing operation will not be performed after the restart. It is possible to provide a computer system in which displaying can be resumed without any problem, as in the case where the display processor is started operating in the initial state, and subsequent display requests can be correctly accepted. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the invention, and FIG. 2 is a diagram for explaining the invention in detail. DESCRIPTION OF SYMBOLS 1... Bus, 2... Keyboard, 3... Processor (CPU) for task execution, 4... Processor for management and display, 4a... Memory, 5... Display.

Claims (1)

[Scope of Claims] Display control for managing windows and displaying them on a display means in response to a display request from a processor for executing a task so that the display information from the processor that requested the display is displayed in the window to be displayed. In a computer system equipped with a processor for display control, the task execution processor is configured to have a function of terminating the display request upon receiving a screen display forced termination code, and the display control processor is configured to have a function to terminate the display request. 1. A computer system, characterized in that the computer system is configured to initialize itself at startup, and to send the screen display forced termination code to the task execution processor.