JPS6210724A - Picture control system for multi-job system - Google Patents

Abstract

PURPOSE:To prevent the destruction of displaying data by providing a means to discriminate to store the displayed data stored in the first screen buffer whether in the second screen buffer or in the work memory. CONSTITUTION:When the program of the occupying attribute occupies a screen buffer SB1 and the request of the execution of the program occupied by a work memory WRKM and the displaying change-over by an operator occurs, the data are displayed by a screen buffer SB2. Only when the displaying data of the program of the occupying attribute are displayed, the screen buffer SB1 is selected and displayed by a displaying selector 8. Thus, when the program is executed which is not the occupying attribute, the displaying is always controlled by a window control part 1 so as to use the screen buffer SB1, and when the program of the occupying attribute is executed, the displaying data are stored in the screen buffer SB1 without fail, and the displaying data of other program are not destructed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a multi-job system for a computer that simultaneously executes a plurality of programs, and more particularly to an image management method in a multi-job system that manages display processing in a plurality of programs.

[Traditional technique]

2. Description of the Related Art As office computers and personal computers have been put into practical use and used in various fields, there has been a demand for computers that can perform highly functional processing.

For example, an fB-user multi-job system that can run multiple programs at the same time is one of the particularly requested functions.

Generally, when a single user multi-job system executes a plurality of programs, for example, three programs at the same time, they are divided into foreground jobs and background jobs. A foreground job is a job that writes display data to a screen buffer connected to a display device, displays the display data on one display device, and can also capture input data from a keyboard. Background jobs cannot do those things.

If there is an execution that should be displayed on a display device, the program managing the bank ground job indirectly displays data in a work buffer or a screen buffer that is not connected to the display device, that is, a screen buffer that is not selected. is written.

When displaying the display data of such a background job or inputting data that should be entered from the keyboard, the operator can switch between the foreground job and the background job by inputting a specific screen switching command from the keyboard. was. In a system with one screen buffer during this switching, the display data being executed in the background job is stored in the work memory, and the display data stored in the work memory at the time of switching is transferred to the screen buffer and displayed. configured to be displayed on the device.

Note that the display data that has been stored in the screen buffer and displayed on the display device is now transferred to the work memory at the time of switching, contrary to the above. FIG. 8 is a state diagram illustrating the conventional system. Screen buffer S
It has one B and three work memories. Three work memories WRKI are provided for programs executed in three partitions Po+ to PO3 (not shown).

WRK2. WRK3 is made compatible and the display data of each work memory is sent to the screen buffer S when two display requests are made.
H and displayed on two display devices. FIG. 8<A) shows the display data of the birch partition PO3; FIG. 8(B) shows the case of displaying the display data of the partition PO+ from the state in FIG. 8(A).

FIG. 8(C) shows the case where the display data of partition PO2 is displayed from the state shown in FIG. 8(B). If some display data is stored in the screen buffer SB and you want to display the display data of a program in another partition, store the currently displayed display data in the work memory of the corresponding partition, and then display the new data. The display data of the partition to be displayed is stored in the screen buffer. A system having a plurality of screen buffers is configured to switch the screen buffer that outputs display data to one display device.

In the aforementioned multi-job system having one screen buffer, a program having an instruction to directly write display data to a specific screen buffer, such as a program executed in a conventional single-job system, is executed as a background job. In this case, the display data of the bank ground job may be written to the screen buffer used by the foreground job, and the display data of the foreground job may be destroyed. The same applies to systems with multiple screen buffers; if another screen buffer is allocated to a program that has an instruction to directly write to a screen buffer, display data will be written to the unallocated screen buffer, so the screen The display data of the job occupying the buffer may be destroyed. On the other hand, in a single job system, 11 [1
Since only job i1 is executed, a processing routine that monopolizes one display device, such as a program that directly writes display data to the screen buffer (instructions), will operate normally and end.

Even if it works fine in single job system.

In a multi-job system, operators must independently manage programs that operate abnormally, and operations such as running such programs as foreground jobs become complicated.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to enable programs that have instructions to directly write display data to the screen buffer to operate normally, and to enable multiple programs to run simultaneously. An object of the present invention is to provide an image management method for multi-jobs in which display data is not destroyed even when the drive is performed.

[Key points of the invention]

The present invention is characterized in that a computer system capable of executing multi-jobs includes a first screen buffer, at least one second screen buffer, and a display screen for a plurality of programs to be executed on the computer system. a first selection means for allocating and storing data in the first screen buffer and the second screen buffer in units of programs; and a starting program among the plurality of programs assigning display data to the first screen buffer. a determining means for determining whether or not there is a writing instruction without going through the first selecting means;
．． a second selection means for selecting a second screen buffer and displaying it on the display device;

The work memory not selected by the first selecting means and the program started by the determining means are selected by the first selecting means.
control for allocating display data output by the activated program to be stored in the first screen buffer when it is determined that there is an instruction to write the display data to the screen buffer of the program without passing it through the first selection means; With means.

a first display data moving means for moving display data stored in each of the first screen buffer and the second screen buffer;

a second display data moving means for moving display data stored in the first screen buffer and the work memory respectively; and a second display data moving means for moving display data stored in the first screen buffer and the work memory; An image management method for a multi-job system is provided, comprising means for determining whether to store the image in the screen buffer of the computer or the work memory.

(Embodiment of the Invention) An embodiment of the present invention will be described in detail below using one drawing.

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, and FIG. 2 is an operation flowchart of the circuit shown in FIG.

The input device 1 has a keyboard and is operated by an operator. When the device starts operating (START 1 ), input data input (S+) from the key of the input device 1 is applied to the input data discriminator 2 . The input data determining unit 2 is a circuit that determines what kind of command the input data corresponding to the key operated by the operator is (S2). If the data input from the input device 1 is a startup command for a specific program, the input data determination unit 2
outputs the name of the program to be started and a load command to the program loader 3, and outputs a selection signal to the window control unit 4 if the input data is a display selection command. Further, if it is another command or data, the command or data is outputted in correspondence with a device not shown. When the program name and load command are input to the program loader 3 from the input data discriminator 2, the program loader 3 reads the specified program from the auxiliary storage device 6 and performs the loading process S3.
I do. Further, when the selection signal is applied to the window control section 4, the window control section 4 performs screen switching processing S4.

FIG. 3 is an operation flowchart showing the loading process S3 of the program loader 3. In the system according to the embodiment of the present invention, when running a program, the display screen corresponding to the partition is always selected and executed.

(Note that a partition is an area in which memory is divided into multiple parts, and each program is loaded and executed in a partition.) Furthermore, a program is loaded into an empty partition, and its display data is displayed in an empty partition. allocated to the current screen buffer. After the start of the load process S3 (START 2), first input is made from the input device 1. A screen switching process S4 corresponding to the s-tion specification data is performed. This screen switching S4 will be described later.

This is a process of selecting a plurality of screen buffers, that is, window buffers that store display data to be displayed on a display screen corresponding to a plurality of partitions. The screen switching process S4 not only switches the screen but also stores the active partition number in the active partition register AP of the register 7. still.

This screen switching process is performed by the window control section 4 under the control of the program loader 3. The program loader 3 is connected to each partition P#1゜PH1, PH3 of the memory 5, and the active partition register AP and attribute register AT of the register 7. After the two-screen switching process S4, the program loader 3 is connected to the auxiliary storage 6, and loads the program into the partition corresponding to the active partition number stored in the active partition register AP (S5). Furthermore, the attributes of the loaded program are also stored in the attribute register AT of the read register 7 (S5).

Then, the attribute register AT of register 7 is read and it is determined whether the loaded program has the exclusive attribute (S6
)do. When the attribute is an exclusive attribute, 1 is stored in the attribute register AT, so this determination is made based on whether AT=1 or not. When the loaded program does not have exclusive attribute (N)
The program is designed to allow multi-jobs, so it will not write to a screen buffer that is currently in use by another program. Therefore, the loading process ends with the screen still selected in the screen switching process S4 described above. On the other hand, when it is an exclusive attribute.

It is determined whether a program running in another partition has an exclusive attribute (S7). Window control section 4
has an error flag register EF, and when a program with an exclusive attribute is running in any partition, the partition number being executed is stored in this flag register, and when a program with an exclusive attribute is not running. FFH (H represents hexadecimal).

Therefore, the program loader reads the contents of the error flag register EF of the window control section 4, and performs a determination process (S7) by comparing whether the contents are FFH or not. For example, if two programs both have the exclusive attribute,
If they are executed simultaneously, the display data will be written separately to the same screen buffer.

The determination process (37) prevents this.

If the exclusive attribute program is already being executed, that is, the determination process (S7) is N, an attempt is made to execute the exclusive attribute program twice, and error processing ERROR is executed.
I do. This error handling.

Although a detailed explanation will be omitted since it is not related to the present invention, it is, for example, a process of outputting an error message or the like to a screen buffer that is selected and whose contents are output to a display device. If it is not occupied elsewhere (Y), the partition number (at this time stored in the active partition register AP) of the partition into which the exclusive attribute program to be executed is loaded is stored in the error flag registers IF and F (S8 )do.

In the embodiment of the present invention, the screen buffer SBI is directly accessed by the exclusive attribute program.

In order to execute a program with an exclusive attribute, it is necessary to determine whether a program running in another partition is using the screen buffer SBI, and if so, it must be replaced with another buffer.

FIG. 5 is a state diagram showing a state in which an original program is loaded into an empty partition and at the same time display data is allocated to an empty screen buffer or work memory. Figure 5 (A) - (
C) (a) The display data of Hahertijohn P#1 (the program with the exclusive attribute is loaded) is stored in the screen buffer SB 1. Work memory WR
KM is allocated to screen buffer SB2. In the figure, P+ to P3 are screen buffers and work memories WR that store display data of programs executed in each partition by partition registers P1 to P3 included in the window control unit 4.
This indicates which partition is directing, ie, allocating, the KM. For example, in Figure 5 (A
) - (In al, the display data of the program being executed in partition P#2 is stored in the work memory WRKM, the display data of the program in partition P#1 is stored in the screen buffer SBI, and the display data of the program in partition P#3 is stored in the screen buffer SBI. If screen buffer SB1 is assigned to store the display data of the program of partition P#1 (FIG. 5(A)), screen buffer S
The screen buffer SBI is selected and displayed using the 9 display selector 8 without changing the BI allocation. In addition, when allocated to work memory WRKM (Fig. 5 (B)
)) First, the display data stored in the work memory WRKM is put into the screen buffer SBI, and the display data stored in the screen buffer SB1 is put into the work memory WRKM. Then, the data in the work memory WRKM and the screen buffer SB1 are exchanged. Although not shown in Figure 1, the data specified by partition register P++P2 is replaced (partition register P1 stores data specifying screen buffer SBI, and partition register P
2 stores data instructing the work buffer WRKM). After this replacement, the screen buffer SBI is selected and displayed by the display selector 8. If the screen buffer SB2 is allocated to the screen buffer SB2 (FIG. 5(C)), the display data is replaced in the same manner as described above, the partition register P+ and the partition register P2 are also replaced, and the display is further switched.The processing after S9 in FIG. This corresponds to processing in these display states.

First, the program loader 3 reads the partition registers P+ to P3 included in the window control unit 4 and searches for which partition is using the screen buffer SBI (S9).

(The partition number is assumed to be X.) Partition registers P1 to P3 contain partitions P#1 to P#.
Screen buffer SB1.3 used by the program.
Since data that instructs SB2 and work memory WRKM is stored, this process uses screen buffer SB.
The number of the partition register storing the data corresponding to I, that is, the partition number is determined. next.

The X obtained in step S9 is compared with the partition number stored in the active partition register AP (Sho).

In the embodiment of the present invention, partition P#1 in memory 5
．． P#2. Screen buffer SB1 in the same memory 5 as P#3. There is not always a one-to-one correspondence with SB2 and work memory WRKM, but empty screen buffer SB1°SB2 and work memory WRKM are selected and made to correspond. The window control section 4 performs this corresponding processing and also performs screen switching processing S4, which will be described later.

Each partition P#1. P#2. The display data of the program executed by P#3 is sent to the screen buffer SBI in the memory 5 via the window control unit 4.

It is configured to join SB2 and work memory WRKM.

In the comparison process Sho, if x=AP and Y, a program in another partition is using the screen buffer SW.
In the case where the screen buffer SBI which does not occupy the screen buffer I and is empty in processing S4 is selected (Fig. 5 (A)
), and at this time, the program with the exclusive attribute that should be executed can be executed as is, so this loading process is terminated (
END). On the other hand, when x = not AP (N), other non-occupied programs are screen buffer SBI.
Therefore, in order to free up the screen buffer SBI, a process S++ is performed to search for the partition number y that is using the screen buffer SB2, that is, it corresponds to the screen buffer SB2. And the partition number y using screen buffer SB2 is the process S described above.
It is determined whether the number matches the partition number loaded in Step 5, that is, the partition number stored in the active partition register AP (S12).

When y=AP is not determined (N) in S12>,
Active partition is work memo IJW RK
Since it corresponds to M (Fig. 5 (B)).

A process S13 is performed in which the contents of the work memory WRKM and the screen buffer SBI are exchanged, and the corresponding partition registers are also exchanged. Note 1: This processing is performed by the program loader 3 that can access the memory 5. Partition register PI-P3 stores the display data of programs executed in partitions P#1 to P#3 in which screen buffer and work memory WRK.
Since data instructing whether to store the data in M is stored, the program that was outputting display data to the screen buffer SBI through this process will output display data to the work memory WRKM in subsequent executions. Also, the program of the partition whose number is stored in the active partition register AP outputs display data to the screen buffer. Determination (in S12>) If F=AP (Y), then
If the active partition number stored in the active partition register AP matches the partition number corresponding to screen buffer SB2 (Fig. 5(C)), screen buffer SB2 and screen buffer SBI Processing Sat is performed to replace the contents of , and also replace the corresponding partition register. Note that this processing is performed by the program loader 3 that can access the memory 5. Through this processing, display data is output to the screen buffer SBI in the same way as described above (the program will output display data to the screen buffer SB2 in subsequent executions. Also, the partition number stored in the active partition register AP) The program outputs display data to the screen buffer.Screen buffer SBI and screen buffer SB2 are connected to display selector 8, and display selector 9 selects the display data to be added using a control signal applied from window control section 4. hand.

Output to the display device 9. The active partition register A is activated by the above-mentioned process S+3 or process S+a.
The partition with the partition number stored in P will output display data to the screen buffer SBI, and in order to display this, the window control unit 4
outputs a control signal for selecting the screen buffer SBI to the display selector 8, and selects the screen buffer SB+ (315). Then, the program loading process S3 ends. After this program loading process S3, the loaded program is executed by a circuit not shown. 0
Through the above operations, even if a program with an exclusive attribute is loaded and executed, the screen buffer SBI is selected and the screen is switched, so that the display data of the program being executed is preferentially displayed.

In the program loading process described above, the first display switching process 4 is performed regardless of the occupancy attribute. Then, in the program load process, the screen buffer SDI is processed to be occupied when it has the exclusive attribute. On the other hand, display switching processing S4 is performed before loading, but only this display switching processing S4 is performed when the attribute is not an exclusive attribute.

FIG. 4 is a detailed flowchart of the screen switching process S4. When this process S4 starts execution (START 3), first, the partition number of the exclusive attribute stored in the error flag register EF and the new partition number x+ (the new partition means the partition specified for display or execution by the operator) ) are equal or not is determined S+6. In other words,
It is determined whether the new partition occupies the screen buffer S81. If EF=x+, that is, it is occupied (Y), the new party Yon directly writes display data to the screen buffer SBI, so in order to display it, select the screen buffer SBI using the 1 display selector 8 (S+7). do. On the other hand, when IBF=x+ (N), the partition with the new partition number x1 does not have the exclusive attribute, so it is determined whether the old partition that is being executed first has the exclusive attribute or not S+s
do. If it is not the exclusive attribute, the contents of the partition register in the window control unit 4 corresponding to the old partition and the new partition are exchanged, and the contents of the screen buffer and work memory WRKM in which the corresponding display data is stored are also exchanged (Sl9). This process (
Slq) allows the display data of the program to be executed on the new partition to be displayed. On the other hand, when the old partition occupies the screen buffer SBI, of course the program in the partition with the old partition number y1 has an exclusive attribute, so the screen buffer SBI is not allocated to the new partition, and the process described below is executed. Screen buffer SB2 allocates work memory WRKM. First, in this case, a partition that is currently using screen buffer SB2, that is, corresponds to it, is searched for (320). (Set this partition number as 21.) Then, new partition number x1 and screen buffer 5B2t
- Determine whether or not the partition number 21 of the partition being used matches (S21).

If they match (Y), the display selector 8 selects the screen buffer SB2 (S22). Note that if the program with the exclusive attribute is loaded on another partition at this time, it will not be displayed even if it is executed later (for example, in time-sharing because it is a multi-job), but it will destroy the display data of other screen buffers. There's nothing to do. On the other hand 1
New partition number x1 in determination (S2+)
If the partition number 21 of the partition using screen buffer SB2 does not match (N), work memory WRKM is assigned to the new partition, so work memory WRKM and screen are assigned to display the new version. The contents of the buffer SBI are replaced, and the contents of the corresponding partition register are also replaced (S23). In the embodiment of the present invention, since the display data of the active partition is always displayed on the display device, such replacement is performed when the work memory WRKM corresponds to the new partition, and further processing is performed. Perform 322.

Processing S+ 9,5221 t& of Sl 7, to remember that the old partition is active, stores the new partition number x1 in the active partition register AP, and ends the switching process. The new partition number XI is stored in the new partition register NE of the window control section 4 in FIG. 1, and the screen switching process S4 described above is performed by the window control section 4.

FIG. 6 and FIG. 7 are state diagrams of display switching. still.

In the figure, P1 to P3 represent the screen buffers SBI, SB2 and work memo IJWRKM designated by the respective partition registers P+ to P3, as explained in FIG.

FIG. 6 shows a case where a program with an exclusive attribute is not being executed. FIG. 3A shows a case where display data of partition P#3 is selected to be stored in screen buffer SB2, and at this time screen buffer SB2 is selected and displayed by the display selector. In this state, when displaying the display data of partition P#3 (stored in work memory WRKM) (to execute a program or because switching is requested by the operator), the display data shown in FIG. 6(B) is displayed. As shown in the figure, the display data stored in the work memory WRKM and the display data stored in the work buffer SB2 are exchanged, and the contents of the partition register P+ and the partition register P3 are exchanged. Also, partition P
When displaying the display data #2 (stored in the screen buffer SBI), the contents of the screen buffers SBI and SB2 are exchanged, and the contents of the partition register are also exchanged, as shown in FIG. 5(C).

In this way, the window control section 4 displays the display data of the target job, ie, the program, without switching the display selector. This is equivalent to having only one screen buffer as shown in the prior art. Figure 7 (A)
is when a program with exclusive attribute is being executed.

Program with attribute that occupies screen buffer SBI (loaded in partition P#2 in this case)
is occupied. At this time, even if a program occupied by the work memory WRKM (loaded into partition P#1) is executed or a display switching request is made by the operator.

The screen buffer SB2 is used to display the image (FIG. 7(B)).

Also, only when you want to display the display data of the program with the exclusive attribute, the display selector 8 selects the screen buffer S.
Select BI (Fig. 7(C)) and display it.

Through the above operations, the window control unit 4 controls the display to use the screen buffer SBI whenever a program that does not have the exclusive attribute is executed. Also, when executing a program with an exclusive attribute, its display data will always be stored in the screen buffer SBI.
It will not destroy the display data of other programs.

〔Effect of the invention〕

As described above, the present invention provides a plurality of screen buffers, one of which is used for display when a program with an exclusive attribute is executed.2 According to the present invention, a program with an exclusive attribute is Even when executed as a job, it is possible to perform an image management method in a multi-job system that prevents destruction of display data of other programs that are not currently being executed with an exclusive attribute.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention. FIG. 2 is a flowchart of an embodiment of the present invention. FIG. 3 is a detailed flowchart of program loading processing. FIG. 4 is a detailed flowchart of the screen switching process. FIGS. 5(A)-(C), FIGS. 6(A)-(C). FIGS. 7(A) to 7(C) are respectively state diagrams of display switching in the embodiment of the present invention. FIGS. 8(A) to 8(C) are state diagrams of conventional display switching. 3...Program loader. 4...Window control section. 5...Memory. 6...Program loader. 7...Register. 8...Display selector. 9...Display device. SBI, SB2...Screen buffer. WRKM...Work memory. PI, P2. P3...Partition register. Patent Applicant Casio Needle Calculator Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] In a computer system capable of executing multi-jobs, a first screen buffer, at least one second screen buffer, and display data of a plurality of programs executed on the computer system are stored in the first screen buffer.
a first selection means for allocating and storing each program in the screen buffer and the second screen buffer;
a determining means for determining whether or not a startup program among the plurality of programs has an instruction to write display data to the first screen buffer without going through the first selecting means; a second selection means for selecting and displaying the second screen buffer on a display device; and a work memory that is not selected by the first selection means;
When the determining means determines that the program to be activated has an instruction to write display data to the first screen buffer without going through the first selecting means,
control means for allocating display data output by the activated program to be stored in a first screen buffer; and display data stored in each of the first screen buffer and the second screen buffer. a first display data moving means for moving; a second display data moving means for moving display data stored in each between the first screen buffer and the work memory; and a first screen buffer. an image management method in a multi-job system, comprising: means for determining whether display data stored in the second screen buffer is to be stored in the second screen buffer or in the work memory.