JPS59109943A - Circuit processing controlling system of communication control device - Google Patents

Abstract

PURPOSE:To increase the number of circuits which can be connected actually, comparing with the number of circuits which can be processed simultaneously, in case when the circuit efficiency is low, by controlling the circuit processing in the course of management of the number of circuits which are being processed actually. CONSTITUTION:When a communication control device is started, a program control part 5 supervises an interruption between a circuit processing request and a circuit processing request. When the interruption is generated, whether it is a request interruption or an end interruption is decided, and if it is the request interruption, whether the number N of circuits which can be processed simultaneously is > the number (n) of circuits which are being processed or not is decided. If the number of circuits N is > (n), the number of circuits (n) is brought to an increment by ''1'' and the circuit processing is executed. In case when it is decided that the number of circuits N is <=(n), its request is registered in a queue 8. When the processing of some circuit is ended, and the end interruption is generated, the number of circuits (n) is brought to an increment by ''1'', and unless the circuit processing request exists in the queue 8, it is returned to its original state. According to such a constitution, the lower the circuit efficiency is, the larger the number of connecting circuits can be made than the number of circuits which can be processed simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a line processing control method in a communication control device.

[Prior art]

Generally speaking, the efficiency of lines connected to communication control devices is quite low. However, due to the nature of the communication control device, it must be able to process even when data is sent and received at the same time. Conventionally, this has been dealt with by determining an upper limit on the number of lines that can be connected. In other words, conventional communication control devices determine the number of connected lines in such a way that processing is possible when data is sent and received at the same time, regardless of line efficiency. However, if there are many terminals to be connected, a communication control device must be added.

[Purpose of the invention]

An object of the present invention is to provide a line processing control method for increasing the number of connected lines by maximizing the line processing capacity of a communication control device.

[Summary of the invention]

FIG. 1 shows an example of data transmission and reception between the communication control device and the lines for lines A, B, and C.

At time T1, lines A, B, and C are all in POLL (polling). Also, at time T2, only line C is in operation. At time T3, only lines A and C are in operation, and line B is idle. As described above, since the number of lines in operation changes from time to time, the amount of processing that must be controlled varies depending on the amount of data sent and received to the #transfer line. In other words, if the number of lines that can be processed simultaneously by a communication control device (for a device controlled by a program, it is determined by the number of program steps that can be run within the allowable time) is the same as the number of connected lines, the actual communication control The line processing capacity of the device will not be fully utilized. In the past, such waste was ignored.

Also, when focusing on a specific line, as shown in Figure 2, time a is exclusive time that must be controlled (followed by a program) once processing starts, but time b is a general time. There are no specific regulations on the interface, and this is idle time where processing can be delayed to some extent. Therefore, if the central activation method of polling/selection as shown in the figure is used, it is possible to delay the polling or selection operation according to the convenience of the communication control device.

From the above, if the communication control device controls line processing while managing the number of lines that are actually being processed, the number of lines that can actually be connected can be increased in terms of line efficiency.

Focusing on these points, the present invention provides a means for counting the number of lines being processed in a communication control device, and a determining means for determining whether new line processing can be started by referring to the counted value by this means. and cue means. When a new line processing request occurs, if the determining means determines that the line processing can be started, the line processing request is immediately accepted and the processing is started; (3) if the line processing request is made to wait in the queue means, and the line processing request that is waiting in the queue means can be started.

On the condition that the judgment is made by the judgment means, the line is accepted and the line processing is started.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 3 and 4.

FIG. 3 is a schematic block diagram of the communication control device.

In the figure, 1 is a channel control unit that sends and receives commands and data from a central processing unit (not shown), 2 is a line control unit that controls data transmission and reception with the line, and 3 is a program control unit that controls the entire device. This is the central control unit of the system.

The central control unit 3 includes a ROM 4 storing a control program;
It is comprised of a program control section 5 that decodes the commands of the control program in the ROM 4 and executes control of the line control section 2 and channel control section 1, data processing, etc., and a RAM 6 that is accessed by the program control section 5.

In this RAM 6, areas for a counter 7 and a queue 8, which will be described later, are secured.

The general operation is similar to a conventional communication control device, (4)
.

Therefore, only line processing control will be explained.

FIG. 4 is a schematic flowchart of line processing control, and this processing is executed by the program control section 5 according to the program in ROMd.

When the communication control device starts, the program control unit 5 clears the value (n) of the counter 7 (step 100).
), interrupts of line processing requests (polling/selection requests from the central processing unit) and line processing completion interrupts are monitored (step 101).

When an interrupt occurs, it is determined whether it is a request interrupt or an end interrupt (step 102).

If it is a requested interrupt, it is determined whether N>3 (step 103). Here, N is the number of lines that can be processed simultaneously by the communication control device. Note that it is assumed here that all connected lines have the same line speed.

If N > n, accept the line processing request,
7L is incremented by 1 (step 104), and the line processing is immediately started (step 105).
, and then returns to step 101. In other words, the value of the counter 7 indicates the number of lines being processed by the communication control device.

If it is determined in step 103 that N≦1, it means that the number of lines that has reached its processing capacity is already being processed, so the line processing request should be registered in the queue 8 (step 10).
6), return to step 101.

When processing for a certain line is completed and a termination interrupt occurs,
The process jumps from step 102 to step 107, and increments 1 by 1. Next, it is determined whether there is a waiting line processing request in the queue 8 (step 108). If there are no waiting line processing requests, the process returns to step 101. If there is a waiting line processing request, the line processing request with the highest priority among them is accepted and the queue 8 is updated (step 109), and the process proceeds to step 104 and thereafter.
Starts execution of the line processing.

Since the communication control device of this embodiment performs such line processing control, it is possible to increase the number of connected lines considerably more than the number N of lines that can be processed simultaneously, and the increased number of lines has low line efficiency. It is clear that it can be made larger.

In the above embodiment, all the connection lines had the same line speed, but if the line speed differs depending on the line, the line processing control program can be easily changed, for example, as shown in the flowchart of Fig. 5. can correspond to

The processing of this modification will be explained with reference to FIG.

Step 200)
, enters an interrupt wait state (step 201).

When an interrupt occurs, it is determined whether it is a request interrupt or an end (step 202). In the case of a requested interrupt, a value α corresponding to the speed of the line from which the processing request was issued is determined, for example, from Table 1, and added to .

Table 1 ゛(7)・ More practically, for example, a correspondence table between line numbers and α is prepared in advance in the memory 6 (Fig. 3), and the α value can be calculated by referring to the correspondence table using the line number. demand.

Next, it is determined whether N≧L (step 204).

Here, N is not the number of lines that can be processed simultaneously, but
This is a value converted based on line speed. For example, if a 2400 bit/second line can be processed simultaneously on the Sekiguchi line, N=
1.2 Set X50=600. Note that the counter value L is also a value obtained by multiplying the number of lines being processed by its α value and converting it into a speed.

If it is determined in step 204 that N≧L, the request for line processing is accepted, the line processing is started (step 205), and then the process returns to step 201. Step 2
If N < n in Step 04, the α value added in Step 203 is subtracted from Le (Step 206), and the line processing request at that time is registered in Queue 8 (Fig. 3) (Step 20).
7).

When processing for a certain line is completed and a termination interrupt occurs, the α value corresponding to the speed of the line is calculated using the method (8) described above, and the α value is subtracted from the line (step 208).
). Next, it is determined whether there is a waiting line processing request in the queue 8 (step 2o9). If no line processing request is waiting, the process returns to step 201, but if there is, the line processing request with the highest priority is selected and an α value corresponding to the speed of the line is added to the line. (step 210). Then, it is determined whether N≧R (Step 211), and if N≧R, the line processing request is deleted from the queue 8 (Step 212), and the process jumps to Step 205 to start processing the line. N in step 211
(If it is determined to be n, the α value is subtracted from the value of R (step 213), and then the process returns to step 201.

Although the embodiments of the present invention have been described above, the present invention is not limited to only the configuration thereof, and can take various modified embodiments.

〔Effect of the invention〕

Since the present invention has the above-described configuration, when the line efficiency is low, the number of connected lines can be considerably larger than the number of lines that can be simultaneously processed by the communication control device. Generally, the line efficiency of the line connected to the communication control device is quite low.

Therefore, according to the present invention, the number of connected lines can be significantly increased without changing the original line processing capacity of the communication control device, the number of installed communication control devices can be reduced, and an economical system can be realized.

[Brief explanation of drawings]

Fig. 1 is a timing diagram showing the flow of data between the communication control device and the line, Fig. 2 is a timing diagram for explaining exclusive time and idle time in one line, and Figs. 3 and 4 are A block diagram and a flowchart for explaining one embodiment of the present invention, and FIG. 5 is a flowchart for explaining a modified embodiment of the same embodiment. 1... Channel control unit, 2... Line control unit, 3...
- Central control unit, 4... ROM, 6... RAM, 7... counter, 8... queue.・α■・ 234−

Claims (1)

[Claims] The communication control device is provided with a means for counting the number of lines being processed, a determining means for determining whether new line processing can be started by referring to the count value by this means, and a queue means. When a processing request occurs, if the determining means determines that the line processing can be started,
The line processing request is immediately accepted and the line processing is started, and if it is determined that it is impossible, the line processing request is made to wait in the queue means, and the line processing request that is waiting is sent to the queue means. A line processing control method for a communication control device, characterized in that the line processing is started upon acceptance on the condition that the determining means determines that the line processing can be started.