JPS5813935B2 - How to select input/output devices in a multiple computer system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for selecting an input/output device in a multi-computer system in which a plurality of computers for controlling a plurality of input/output devices are provided and a transmission program for transmitting data between the computers is provided.

When specifying an input/output device in a multiple computer system and controlling that input/output device, consider whether data transmission is necessary depending on which computer controls the specified input/output device. You need to create a program.

Conventionally, this type of program has belonged to a part of an application program created by a user according to system specifications.

This has the disadvantage that creating and debugging application programs becomes complicated.

The present invention eliminates the need for data transmission when creating application programs, and enables easy creation and debugging of application programs. The purpose is to provide a method for selecting an output device.

In this invention, each computer has a first table that stores information specifying input/output devices to be controlled by that computer, start address information of a storage area of a control program, etc., and a computer controlled by another computer different from the computer. A second table that stores information specifying the input/output device to be used and start address information of the data transmission program, etc., and a specific address of the first table or the second table selected by specifying the address corresponding to the input/output device. A third table is provided.

Therefore, it is possible to start the control program or transmission program just by following the data in the first table or the second table starting from the third table, and there is no need to consider the necessity of transmission when creating an application program. become.

Further, in the present invention, each computer reads the data of the first table or the second table from the third table, and when the first table is used, starts the control program and selects the specified input/output device, When the second table is used, a transmission program is activated to transmit information specifying the human output device to another computer.

Therefore, there is no need to judge the necessity of data transmission, and data transmission can be performed using a simple program.

Note that the input/output device in this invention is a general term for input devices and output devices, and is not limited to devices that have an input function and an output function, but also includes devices that only have an input function or only an output function. This also includes the equipment that was used.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a small-scale multiple computer system.

1 and 2 are data processing devices provided separately.

Each of the data processing devices 1, 2 has a calculator 10 with a microprocessor and a storage device, a key input device 11 for inputting data, and a controller 12 for data transmission.

The data processing device 1 further includes m controllers 13-1 to 13-m and controllers 13-1 to 13-m.
Input/output devices 14-1 to 14 respectively controlled by
-m.

The data processing device 2 has n controllers 15-1 to 15-1.
5-n, and input/output devices 16-1 to 16-n respectively controlled by the controllers 15-1 to 15-n.

FIG. 2 is a diagram showing the relationship between a storage area related to the selection of an input/output device out of the storage area 20 of the storage device of the computer 10 of the data processing device 1, and a program counter and register group in the microprocessor. .

21 specifies information specifying the input/output devices 14-1 to 14-m controlled by the computer 10 of the data processing device 1, information on the start address of the storage area 22 of the control program, etc. to the input/output devices 14-1 to 14-m. This is the first table stored for each time.

23 specifies information specifying the input/output devices 16-1 to 16-n controlled by the computer 10 of the data processing device 2, information on the start address of the storage area 24 of the transmission program, etc. to the input/output devices 16-1 to 16-n. This is the second table stored for each time.

25 stores the corresponding addresses of the first table 21 corresponding to each of the input/output devices 14-1 to 14-m,
This is a third table that stores the corresponding addresses of the second table 23 corresponding to each of the input/output devices 16-1 to 16-n.

26 is a storage area for application programs.

27 is the input/output device 14-1~141m, 16-1~1
This is a storage area for data to be given to a designated one of 6-n.

31 is a program counter.

32 to 34 are registers.

FIG. 3 is a diagram showing the relationship between table 3, table 1, and table 2.

51-1 to 51-m, which is the = section of the storage area 25, are addresses of storage areas 53-1 to 53-m that constitute the storage area 21, respectively, corresponding to the input/output devices 14-1 to 14-m. This is the storage area that stores .

Storage areas 52-1 to 52-n forming the remaining part of the storage area 25 correspond to the input/output devices 16-1 to 1610, respectively, and storage areas 54-1 to 54-n forming the storage area 23, respectively.
n storage area.

Next, the operation will be explained.

First, the computer 10 of the data processing device 1 is connected to the input/output device 14.
A case will be described in which the data in the storage area 27 is supplied by selecting -2.

Now, by executing the application program in the storage area 26, the address information of the storage areas 51-2 is set in the register 33, the start address information of the storage area 27 is set in the register 32, and the program counter 31 is set in the storage area 51-2. Assume that the address of a predetermined storage area in 26 is specified.

The calculator 10 of the data processing device has a program counter 3.
1 is supplied to the storage device, the instruction is read from the storage area 26, the instruction is set in a register (not shown), the instruction is decoded, ``1'' is added to the data in the program counter 31, the instruction is executed, and the same operation is performed. repeat.

Since this specific operation is generally well known, a detailed explanation will be omitted, and the execution of the command will be described below.

The storage device is accessed using the data in the register 33 (address information of the storage area 51-2), and the address information of the storage area 53-2 is read from the storage area 51-2 to the register 34 (arrow A in FIG. 2).

Next, the storage device is accessed using the data in the register 34, and information specifying the input/output device 14-2 and the start address information of the storage area 22 are read out from the storage area 53-2 into the register 33 (see arrow B in FIG. 2). ), the start address information of the storage area 22 read out to the register 33 is set in the program counter 31 (arrow C in FIG. 2).

Thereafter, according to the control program stored in the storage area 22, the data in the storage area 27 is transferred to the controller 13-2.
is supplied to the input/output device 14-2 via the input/output device 14-2.

At this time, the input/output device 1 stored in the register 33
The controller 13-2 is selected with the data specifying 4-2, and the first data is read from the storage area 27 using the start address information of the storage area 27 stored in the register 32 and sent to the controller 13-2. , register 32
Add “1” to the memory value of , and do the same in the same manner as above in the memory area 27.
The data is sent to the input/output device 1 via the controller 13-2.
Supply to 4-2.

Next, the computer 10 of the data processing device 1
A case will be described in which data in the storage area 27 is transmitted to the data processing device 2 by specifying -1.

Now, the address information of the storage area 52-1 is stored in the register 33.
It is assumed that the address information of the storage area 27 is set in the register 32.

The computer 10 of the data processing device 1 accesses the storage device using the data in the register 33 and reads address information of the storage area 54-1 from the storage area 52-1 into the register 34.

Then, the data in the register 34 is used to access the storage device, and the information specifying the input/output device 16-1 from the storage area 4-1 and the start address information of the storage area 24 of the transmission program are read into the register 33 (the first 2, arrow D), the start address information of the storage area 24 read out to the register 33 is set in the program counter 31.

Thereafter, the data in the storage area 27 is transmitted to the data processing device 2 according to the transmission program stored in the storage area 24.

The transmission program consists of a driver stored in a storage area 28 within the storage area 24 and a main routine stored in a storage area 29.

The start address of the storage area 24 is also the start address of the driver.

The driver is activated by designating the start address by the program counter 31, and registers 34
The address information of the storage area stored in is placed in a queue (not shown).

The main routine operates independently of other programs.

This is possible by programming using well-known multiprogramming techniques.

The main routine monitors the standing queue 3 times, and when it detects that there is address information in the queue, it refers to the second table based on the address information, deletes the address information from the queue, and then updates the second table. The referenced information specifying the input/output device and data requesting buffer reservation are sent to the data processing device 2 via the controller 12.12.
The information is sent to the computer 10 of

When notified by the data processing device 2 that the buffer has been secured, the data in the storage area 27 is sent to the data processing device 2, and when the completion code sent from the data processing device 2 is received, control is transferred to the application program. Return and repeat the above operation at regular intervals.

Since these are generally well known, illustration and further detailed explanation will be omitted.

Note that the computer 10 of the data processing device 2 selects the controller 15-1 based on the information specifying the input/output device 16-1 received from the data processing device 1, and transfers the received data stored in the buffer to the controller 15-1. The completion code is supplied to the input/output device 16-1 via the data processor 1, and the completion code is sent to the data processing device 1.

In the above embodiment, a case has been described in which the data processing device 1 specifies the input/output device controlled by the computer 10 of the data processing device 2 and outputs data. When inputting data, that is, when receiving data from the data processing device 2, the input/output device can be specified in the same way.

In addition, the same thing as shown in FIG.
By providing it within 0, the data processing device 2 can also specify the input/output device controlled by the data processing device 1.

In this case, information specifying the input/output device of the storage areas 53-1 to 53-m in FIG.
-n information specifying the input/output device is exchanged with the storage areas 51-1 to 51-m and the storage areas 52-1 to 52-5.
2-n are exchanged.

In the above embodiment, there are two data processing apparatuses, but it is also possible to use three or more data processing apparatuses.

In this case, it is necessary to store information indicating which input/output device of which data processing device is to be specified in the second table, so that the data processing device can be specified at the time of data transmission.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the multiple bookkeeping machine system;
The figure shows the main parts inside the computer 10 of the data processing device 1 of FIG. 1, and FIG. 3 shows the storage areas 21, 23, 2 of FIG.
5 is a diagram showing the relationship between 1, 2: Data processing device, 10: Computer, 14-1 to 1
4-m, 16-1 to 16-n: input/output device, 21: first
Table storage area, 23: Second table storage area,
25: Storage area for the third table, 23-34: Registers.

Claims (1)

[Claims] 1 Install multiple computers that control multiple input/output devices,
In a multi-computer system in which each computer is equipped with a transmission program for transmitting data between computers, each computer stores information such as information specifying the input/output device to be controlled by that computer and information on the start address of the storage area of the control program. 1 table and a second table that stores information specifying an input/output device controlled by another computer different from the computer, information on the start address of the storage area of the transmission program, etc.
a table, and a third table that is selected by specifying an address corresponding to an input/output device and specifies a specific address of the first table or the second table, and the computer specifies the address of the third table. to start the control program via the third table and the first table, or to start the transmission program via the third table and the second table, and the control program starts the control program via the first table. selects an input/output device corresponding to the information specifying the input/output device of the second table, and transmits the information specifying the input/output device of the second table to the other computer by the transmission program. How to select input/output devices in computer systems.