JPH02293952A - Data transmission/reception control system - Google Patents

Abstract

PURPOSE:To reduce the decrease of a communication speed caused by a communication control program even if a data transfer of a large scale and a large capacity is executed by increasing and decreasing a data input/output task in accordance with increase/decrease of a data traffic on a session. CONSTITUTION:When a data traffic on a session increases and an input/output buffer use state detecting means 14 detects a fact that the number of use buffers in an input/output buffer 15.2 exceeds the upper limit value, the input/output use state detecting means 14 executes a data traffic increase notice to a data input/output task control means 12. The data input/output task control means 12 generates a data input/output task 13.2 and starts it. The data input/output task 13.2 starts transmission and reception to and from application programs 11.1 - 11.m. As far as this is concerned, the processing executed by only a data input/output task 13.1 up to the present comes to be executed by sharing it with the data input/output task 13.2. In such a way, the decrease of a communi cation speed can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transmission/reception control system in a communication control program for a host computer.

[Conventional technology]

This type of conventional data transmission/reception control system is performed by a one-time data input/output task that starts simultaneously when a communication control program is operated. Even if the amount of traffic increases, only the first data input/output task activated will perform the processing.

[Problem to be solved by the invention]

The conventional data transmission/reception control method described above operates only one data input/output task for the communication control program, so it is difficult to operate in a large-scale network with many online terminals or when many online application programs operate on the communication control program. In data transmission and reception, the data input/output task becomes the rate-limiting step.

As a result, the data input/output task limits the speed of data transmission between the application program and the online terminal, and if this transmission/reception is too inefficient, it will lead to a decrease in the efficiency of online system business operations.

[Means to solve the problem]

The multiple data transmission/reception control methods of the present invention include an input/output channel control means for transmitting and receiving data to and from a terminal device, an input/output buffer for transmitting and receiving data to and from an application program, and an output for detecting the usage status of the input/output buffer. Banhua usage status detection means; at least one data input/output task that performs transmission/reception with the input/output buffer; and additional generation of the data input/output task in response to a traffic notification from the input/output buffer usage status detection unit. and data input/output task control means for deletion.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.

In this embodiment, m application programs 11.1 to 11,m and n data input/output tasks 13.1 to 13.m in the central processing unit 01 are used. n (represented by 13), a data input/output task control means 12 that takes charge of controlling the data input/output task 13, and two buffers that are provided with the number of used buffers and upper and lower limit values necessary for detecting the usage status. An input/output buffer 15.1.15.2 (represented by 15), an input/output buffer usage status detection means 14 that samples the crowd buffer 15 at regular intervals and monitors usage status, and input/output channel control. Sendan 16 and application programs 11.1 to 11. k external terminal devices 17.1 to 17.m transmitting and receiving data to and from k terminal devices 17.1 to 17.
It is composed of k.

I/O buffers 15.1, 15.2 and data I/O tasks 13.1-13. Transmission and reception of data between input/output buffers 15, 1.15.2 and application programs 11, 1 to 11.n. Transmission and reception of data between the input/output channel control means 16 and the input/output channel control means 16 is performed using conventional techniques.

Next, the flow of processing in this embodiment will be explained using FIG.

Currently, application programs 11.1-11. m
and terminal device 17, 1-17. It is assumed that data input/output task 13.1 is in operation and data is being transmitted and received (hereinafter abbreviated as session).

Terminal devices 17.1-17. The data on the session received from the input/output channel control means 16 and the input/output buffer 15.2 are transmitted to the data input/output task 13.1 via the input/output buffer 15.1 to the application program 11.k. 1-11. It is assumed that reception with m is controlled.

In this state, when the data traffic on the session increases and the input/output buffer usage status detection means 14 detects that the number of used buffers in the input/output buffer 15.2 exceeds the upper limit, the input/output buffer usage status detection unit 14 notifies the data input/output task control means 12 of an increase in data traffic.

Upon receiving the notification, the data input/output task control means 12 generates and activates a data input/output task 13.2 (task generation and activation is performed using conventional techniques).

The activated data input/output task 13.2 is the application program 11.1 to 11.1. Start sending/receiving to/from m. This means that the processing that was previously performed only by the data input/output task 13.1 will be shared with the data input/output task 13.2.

As a result, the number of data streams that can be received from the input/output buffer 15.2 increases, and the number of used buffers in the input/output buffer 15.2 falls below the upper limit.

As the number of data input/output tasks 13.2 increases, the number of data streams that can be taken out from the input/output buffer 15.2 increases, but the number of data streams that can be retrieved from the input/output buffer 15.2 increases, but
1,m cannot be taken out from the input/output buffer 15.1, the number of used buffers of the input/output buffer 15.1 increases and may exceed the upper limit. In this case, the input/output buffer usage state detection means 14 detects this, and notifies the data input/output task control means 12 of the data traffic reduction to eliminate the data input/output task 13.2.

The above is the flow when data traffic increases. Next, we will show the flow when data traffic decreases.

Assuming that data input/output tasks 13.1 and 13.2 are operating, the data traffic on the session decreases, and the input/output buffer usage status detection means 14 detects that the number of used buffers in the traffic buffer 15.2 has reached the lower limit. When it is detected that the usage status of the input/output buffer is lower than , the input/output buffer usage status detection means 14 notifies the data input/output task control means 12 of the data traffic reduction.

The data input/output task control means 12 that has received the notification eliminates the last activated data input/output task 13.2.

The processing that was previously shared with the data input/output task 13.2 will now be performed only by the data input/output task 13.1. As a result, the number of data streams taken out from the input/output buffers 15, 2 is reduced, and the input/output buffers 15.2
The number of used buffers within exceeds the lower limit.

Also, data traffic is reduced and input/output buffer 1
5. If the lower limit of 13.1 is exceeded, the input/output buffer usage detection means 14 detects this and notifies the data input/output task control means 12 of an increase in data traffic to start the data input/output task 13.2. .

The above shows the flow of receiving data, but
In the case of transmission, the functions of the input/output buffer 15.1 and the input/output buffer 15.2 are swapped, and the flow is reversed, but the data input/output tasks 13.1 to 13. The mechanism for increasing or decreasing n follows the same procedure.

〔Effect of the invention〕

As explained above, the present invention has a configuration in which the number of data input/output tasks increases or decreases in accordance with the increase or decrease in data traffic on a session, so even if large-scale, large-capacity data transmission is performed, the communication speed decreases due to the communication control program. In addition, since unnecessary data input/output tasks are eliminated, resources within the central processing unit can be used effectively.Furthermore, the interface between the data input/output task control means and the data input/output task has been devised to reduce data input/output tasks. Replacing it with a microprocessor has the effect of making it possible to construct a high-performance communication system at low cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of an embodiment of the present invention. 01...Central processing unit, 11.1-11. m...Application program, 12...Data input/output task control means, 13.1-13. n...Data input/output task, 14...I/O buffer usage status detection means,
15.1, 15.2...I/O buffer, 16...
Input/output channel control means, 17, 1-17. k...Terminal device.

Claims (1)

[Scope of Claims] Input/output channel control means for transmitting and receiving data to and from a terminal device, an input/output buffer for transmitting and receiving data to and from an application program, and output buffer usage state detection means for detecting the usage state of the input/output buffer. at least one data input/output task that performs transmission/reception with the input/output buffer; and a data input/output task that additionally creates and deletes the data input/output task in response to a traffic notification notified from the input/output buffer usage status detection means. 1. A data transmission/reception control method, comprising: output task control means.