JP3133413B2 - Task omission control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a task omission control method, and more particularly to a task omission control method in a multitasking type system in which a plurality of tasks perform control in a distributed manner.

[0002]

2. Description of the Related Art Conventionally, basic functions have been realized by performing inter-task communication of basic function messages between a function provided by task A and a function provided by task B, and extended when an extended function becomes necessary. The task S that provides the function is a task A,
In a multitasking type system in which an extended function is realized by generating, deleting, or processing a basic function message by interrupting the inter-task communication of the basic function message between B, the extended function is not required. After that, the task S was not deleted, and the task S received the basic function message between the tasks A and B and transmitted it without any processing.

[0003]

In the conventional multitasking type system described above, the basic function message between tasks A and B after the extension function is no longer required is transmitted via task S. Originally, the extended function task S must perform basic function processing irrelevant to the extended function unit, which causes an extra load on the processor, deteriorating the processing capacity, and wastes resources. there were.

An object of the present invention is to provide a multitasking system capable of reducing an unnecessary load on a processor because a basic function message between A and B has passed through a task S and improving a processing capability. It is to provide a task omission control method in a king type system.

[0005]

According to the present invention, a basic function is realized by performing inter-task communication of a basic function message between a function provided by a task A and a function provided by a task B. A task S, which provides an extended function when needed, is extended by generating, deleting, or processing a basic function message by interrupting the intertask communication of the basic function message between tasks A and B. In a task loss control method of a multitasking type system that realizes a function and performs control in a distributed manner by a plurality of tasks, when an extended function becomes unnecessary, transmission of a control message for executing task S leaving In order to confirm that the transfer of the basic function message has been stopped, the transmission right control message "general transmission stop request"
And send right control message "General transmission stop response"
The task S retains the basic function message received before receiving from the task A and the task B in the queue without processing, and the task S executes the control message “function S leaving request”.
Are sent to tasks A and B, and the control message “function S
From the tasks A and B, the basic function message is taken out of the queue and transferred to the tasks A and B, and the tasks A and B enter the queue without processing the sent basic function message. After that, the task S transmits a transmission right control message “general transmission restart request” to A and B in order to restart transmission of the general message, and transmits the transmission right control message “general transmission restart request” to the task A. The transmission of task S is completed by the transmission of tasks A and B, and tasks A and B are again transmitted.
It is characterized by returning to a mode of realizing a basic function by sending and receiving a basic function message between the two.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a system configuration diagram showing one embodiment of the present invention, and an explanatory diagram showing the flow of messages between tasks.

In FIG. 1, task A, which has decided to insert a task S for providing an extended function, confirms the stop of the transfer of the basic function message prior to transmission of a control message for implementing the insertion of S. The transmission right control message “general transmission stop request” is transmitted to B, and B is transmitted until the transmission right control message “general transmission stop response” is received.
Without processing the basic function message received from the Queue (hereinafter referred to as QUE) (hereinafter referred to as ENQ).

After transmitting the control message "function S insertion request" and receiving the control message "function S insertion ACK" to complete the task S installation, task A EN message to QUE
Take out in the order of Q (hereinafter referred to as DEQ),
Transfer to The task S ENQs the QUE without processing the sent basic function message.

Then, task A transmits a transmission right control message “general transmission restart request” to tasks B and S in order to restart transmission of the general message, and the incorporation of task S ends.

When the task S receives the transmission right control message “general transmission restart request”, it starts the operation of the extended function. When the operation of the extended function is started, first, all the messages in the QUE are dequeued. , Process basic function messages received from tasks A and B.

The procedure for withdrawing the task S for providing an extended function is similarly performed.

The procedure for leaving task S for providing an extended function will be described below.

First, the task S, which has decided to leave the task S providing the extended function, is transmitted to confirm that the transfer of the basic function message has been stopped before transmitting the control message for executing the release of the task S. QUE without transmitting the basic function message received before transmitting the right control message "general transmission stop request" to A and B and receiving the transmission right control message "general transmission stop response" from A and B. To ENQ. Then, the task S transmits a control message “request for leaving the function S” to A and B, and receives a control message “ACK for leaving the function S” from A and B.

After that, the task S dequeues the basic function message and transfers it to the tasks A and B. Tasks A and B ENQ the QUE without processing the sent basic capability message.

Thereafter, the task S sends a transmission right control message “general transmission restart request” to A and B to restart transmission of the general message, and sends a transmission right control message “general transmission restart request” to the task A. The reception of tasks S and B ends the task S withdrawal.

When the tasks A and B receive the transmission right restoration message “general transmission restart request”, the basic function operation is restarted. When the basic function is restarted, first, all the messages in the QUE are processed by DEQ processing. After that, the basic function message received from the task A or B is processed.

As described above, according to this embodiment, when the extended function becomes unnecessary, the task S is deleted so that the basic function message between the tasks A and B can be transmitted and received without passing through the task S. , B directly.

[0019]

As described above, according to the task omission control method of the present invention, when an extended function is no longer needed, the extended function task S is deleted, and tasks A and B that are irrelevant to the extended function section are originally used. The basic function message does not pass through the task S and performs direct inter-task communication, so that the load on the processor can be reduced, the processing capacity can be increased, and the effective use of resources can be improved. There is a possible effect.

[Brief description of the drawings]

FIG. 1 is a diagram showing a system configuration according to an embodiment of the present invention and a diagram showing a message flow between tasks.

[Explanation of symbols]

 A task providing basic functions A B task providing basic functions B S task S providing extended functions

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 29/08 G06F 9/46 340

Claims (1)

(57) [Claims] A basic function is realized by performing inter-task communication of a basic function message between a function provided by a task A and a function provided by a task B, and when an extended function is required, the extended function is executed. The task S to be provided breaks during the inter-task communication of the basic function message between the tasks A and B,
When the extended function is no longer needed in the task-missing control method of a multitasking type system in which the extended function is realized by generating, deleting, or processing the basic function message, and the functions are distributed and controlled by multiple tasks. Before transmitting the control message for performing the detachment of the task S, the transmission right control message “general transmission stop request” is transmitted to the tasks A and B in order to confirm the stop of the transfer of the basic function message, Task A for transmission right control message "General transmission stop response"
The task S sends a control message “request to leave the function S” to tasks A and B without processing the basic function message received before receiving the message from the task B and the task B. After receiving "leave ACK of function S" from tasks A and B, the basic function message is taken out of the queue and transferred to tasks A and B. Tasks A and B do not process the transmitted basic function message. The task S sends a transmission right control message “general transmission restart request” to A and B in order to restart transmission of the general message, and then transmits a transmission right control message “general transmission restart request”. To task A
A task omission control method characterized in that the task S is terminated by the transmission of tasks B and B, and returns to a mode of realizing the basic function by transmitting and receiving the basic function message between the tasks A and B again.