JP2513029B2 - Task management method - Google Patents

Description

The present invention relates to a task management system in a data terminal device.

[Prior Art] FIG. 3 shows the interrelationship of conventional tasks in a data terminal device of this type. That is, under the operating system 2 ', a plurality of tasks (a line control task 3', a CRT control task 5 ', a printer control task 7') realized by an application program are executed, and the line control task 3'has a communication path. The CRT control task 5'controls the display on the CRT 6 ', and the printer control task 7'controls the output to the printer 8'.

By the way, each of the tasks 3 ', 5', 7'can be executed independently, but it is necessary to synchronize with each other and exchange data (inter-task communication) according to the progress of processing.
It also becomes necessary to perform inter-task communication (inter-terminal communication) with tasks of other data terminal devices.

Conventionally, such inter-task communication is performed directly between the tasks, and inter-terminal communication is performed by directly instructing the line control task 3 '. For example, when the CRT control task 5'requests the printer control task 7'to output to the printer 8 ', the CRT control task 5'instructs the printer control task 7' directly. Is given, and the printer control task 7'outputs to the printer 8'according to the instruction.

[Problems to be Solved by the Invention]

In the conventional data terminal device, each task is executed as described above, and there is no inconvenience in the normal execution stage, but it is difficult to deal with the case where the application program is partially added, changed, or deleted. There was a flaw. That is, since the task-to-task communication and the terminal-to-terminal communication are directly performed between the tasks, the description of the application program of each task is created in consideration of the application programs of other tasks. Even if they were added, changed, or deleted, all the application programs had to be recreated, or even if they were not reached that far, they would require major modifications.

The present invention has been proposed in view of the above points, and an object thereof is to increase the independence of each task and to flexibly deal with partial addition, change, or deletion of an application program. To provide a task management method.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention provides a task management method in a data terminal device connected to another data terminal device via a communication path, comprising: A line control task that controls communication, and a logical unit number of a unique logical unit, the logical unit numbers of the partner task and the own task, the address of the data terminal device where the partner task exists, and a telegram containing the data enable communication between tasks or When a plurality of control tasks that perform terminal-to-terminal communication and a correspondence relationship between the plurality of control tasks and the logical unit numbers assigned to the plurality of control tasks are held and a message is received from the control task, the existence of the partner task in the message When the address of the data terminal device to be processed is the address of the own data terminal device, the logical unit number of the partner task in the message is Pass the message to the control task of the own data terminal device, and if the address of the data terminal device in the message in which the other task exists is the address of another data terminal device, pass the message to the line control task. Let me send
When a message is received from the communication path through the line control task, an LU management task for passing the message to the control task of the own data terminal device corresponding to the logical unit number of the partner task in the message is provided. .

[Action]

In the task management system of the present invention, each control task has a unique logical unit number, and when performing inter-task communication or inter-terminal communication, the logical unit number of the partner task and the own task, the partner task The address of the data terminal device where the
It is sent to the LU management task. The LU management task holds a correspondence relationship between a plurality of control tasks and the logical unit numbers assigned to them, and when a message is received from the control task, the data terminal device in which the partner task in the message exists. Is the address of the own data terminal device, the message is passed to the control task of the own data terminal device corresponding to the logical unit number of the partner task in the message, and the data in which the partner task exists in the message When the address of the terminal device is the address of another data terminal device, the telegram is passed to the line control task and transmitted to the other data terminal device. On the other hand, when a message is received from the communication path through the line control task, the message is passed to the control task of the own data terminal device corresponding to the logical unit number of the partner task in the message.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of a data terminal device to which the task management system of the present invention is applied. In FIG. 1, the line control task 3 is a task for controlling communication with another data terminal device via the communication path 1, and the CRT control task 5 is C
Printer control task 7 that controls the display on RT6
Is a task for controlling the output to the printer 8, and each is centrally managed by an LU (logical unit) management task 4. The LU management task 4 is managed by the operating system 2. A unique logical unit number is set for each task and operating system, and an example of the number is shown in parentheses in the figure. Where CRT
The control task 5 and the printer control task 7 correspond to the "control task" in the claims. In addition, in FIG. 1, in addition to the control task, the line control task 3, LU management task 4,
Although the logical unit number is given to the operating system 2 as well, it is basically sufficient to give the logical unit number only to the control task.

FIG. 2 shows a format of a message sent and received between the tasks in FIG. 1, and the communication between the tasks and the communication between the terminals are performed by this message. In FIG. 2, a telegram 9 includes an area 91 for setting the address of the data terminal device in which the partner task exists and its own data terminal device, and a data terminal device in which the partner task exists for another data terminal device. Area 92 for setting the address, the area 93 for setting the logical unit number of the partner task, and the area for setting the logical unit number of the invoking task
It has an area 94 and an area 95 for setting data.

 The operation of the above-described embodiment will be described below by dividing the case.

(1) When performing inter-task communication within the same data terminal device In this case, in the task on the communication start side, a value indicating the address of the own data terminal device is set in the area 91 of the message 9 and the area 93 is set. The logical unit number of the partner task is set in, the logical unit number of its own task is set in the area 94, the data to be communicated is set in the area 95, and the data is transmitted to the LU management task 4. Received message 9 in LU management task 4
It recognizes from the area 91 of this that it is inter-task communication within its own data terminal device, and then acquires the logical unit number of the partner task from the area 93, and an internal table (not shown).
The electronic message 9 is passed to the corresponding task according to the above. Message 9
In the task that has received, the process based on the data set in the area 95 of the electronic message 9 is performed.

For example, when the CRT control task 5 requests the printer control task 7 to output to the printer 8, a value indicating the address of its own data terminal device is set in the area 91 and the printer control task is set in the area 93. The logical unit number (04) of the task 7 is set, the logical unit number (03) of the CRT control task 5 is set in the area 94, and the telegram 9 in which the data instructing the print is set in the area 95 is sent from the CRT control task 5 Send to LU management task 4. And the telegram 9 is LU
It is passed to the printer control task 7 via the management task 4,
The printer control task 7 outputs to the printer 8 according to the instruction set in the area 95 of the electronic message 9.

(2) When performing inter-task communication with a task in another data terminal device In this case, a value indicating the address of the other data terminal device is set in the area 92 of the message 9 in the task of the communication starting side. , The logical unit number of the partner task is set in the area 93, the logical unit number of its own task is set in the area 94, the data to be communicated is set in the area 95, and the data is transmitted to the LU management task 4. The LU management task 4 recognizes from the area 92 of the received message 9 that it is an inter-task communication with a task in another data terminal device, and the line control task 3 sends it to another data terminal device via the communication path 1. Send message 9.

In the other data terminal device, the electronic statement 9 is received from the communication path 1 by the line control task 3 (the same reference numerals will be used. The same applies hereinafter), and the electronic statement 9 is passed from the line control task 3 to the LU management task 4. In the LU management task 4, it is judged whether or not the area 92 of the message 9 points to its own data terminal device, and if so, the logical unit number of the partner task is acquired from the area 93, and the corresponding task Hand over message 9. Message 9
In the task that receives the message, the process is performed based on the data set in the area 95 of the message 9.

〔The invention's effect〕

As described above, in the task management system of the present invention, when performing task-to-task communication or terminal-to-terminal communication, the logical unit numbers of the partner task and the own task, the address of the data terminal device in which the partner task exists, and Since the management of the transmission of the message is carried out in a unified manner by the LU management task, when the application program is partially added, changed, or deleted, the correspondence between the logical unit numbers in the LU management task is performed. There is an effect that application programs other than the added, changed, and deleted application programs are not affected by only the modification, so that the application program can be easily and flexibly dealt with.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a data terminal device to which the task management system of the present invention is applied, FIG. 2 is a diagram showing a format of a message transmitted and received by the present invention, and FIG. 3 is a conventional data. It is a figure which shows the mutual relationship of the task in a terminal device. In the figure, 1 ... communication path 2 ... operating system 3 ... line control task 4 ... LU management task 5 ... CRT control task 6 ... CRT 7 ... printer control task 8 ... printer 9 ... telegram

Claims (1)

(57) [Claims] 1. A task management method in a data terminal device connected to another data terminal device via a communication path, comprising: a line control for controlling communication with the other data terminal device via the communication path. Multiple tasks that have their own logical unit number and that perform the task-to-task communication or terminal-to-terminal communication by the logical unit number of the partner task and the own task, the address of the data terminal device where the partner task exists, and the telegram containing the data. Of the control terminal, and the correspondence between the plurality of control tasks and the logical unit numbers assigned to the control tasks, and when a message is received from the control task, the address of the data terminal device in which the partner task in the message exists. Is the address of the own data terminal device, the own data terminal device corresponding to the logical unit number of the partner task in the message Passes the message to the control task, when the address of the data terminal equipment in the presence of the other party tasks in the message is the address of another data terminal device, to transmit passes the message to the line control task,
When a message is received from the communication path through the line control task, an LU management task is provided for passing the message to the control task of the own data terminal device corresponding to the logical unit number of the partner task in the message. And task management method.