JPH04188250A - Data communication system - Google Patents

Abstract

PURPOSE:To efficiently use a memory without deteriorating the processing capacity of transmission by providing first and N-numbered communication buffers and plural common communication buffers. CONSTITUTION:An unillustrated application processor processing an application program 11, an unillustrated communication control device controlled by a communication control program 12, a main memory 13 and a communication buffer generation device 14 are provided. The first and the N-numbered communication buffers 31-3N corresponding to first and N-numbered links, and the plural common communication buffers 41 which can correspond to all the first and N-numbered links are provided for the memory 3. When the N-numbered communication buffer is already got at the time of transmitting data to the N- numbered link by a request from the application processor, the communication buffer getting means 15 of the communication control program 12 gets any of the common communication buffers. Thus, the memory 13 is effectively used and data transmission can efficiently be executed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a data communication system, and particularly to data communication in which a communication management device acquires a communication buffer in response to a transmission request from an application processing device and performs communication. Regarding the system.

[Prior Art] Conventionally, in this type of data communication system, one or more communication buffers required for data transmission are provided in advance in memory in correspondence with links.

Alternatively, a plurality of communication buffers common to all links are provided to form a communication buffer Boolean.

In the communication management device that receives the data transmission request signal from the application processing device, the communication buffer get means gets the communication buffer. Here, if a communication buffer is provided corresponding to each link, the communication buffer corresponding to the link is obtained, and if a communication buffer boolean is provided, one of the communication buffers is obtained.

[Problem to be Solved by the Invention] However, in the conventional data communication system, for example, when one communication buffer is provided corresponding to each link, multiple transmissions from an application processing device to one link are required. When there is a request signal, since there is only one communication buffer, only one data transmission can be performed, which poses a problem in that the processing capacity is low.

In addition, if multiple communication buffers are provided for each link, there will not always be multiple data transmission requests for each link, so there will be a problem that there will be many useless communication buffers and memory usage will be inefficient. be.

Furthermore, if multiple communication buffers corresponding to all links are provided, such as a communication buffer boolean, if there are multiple data transmission requests to a specific link, the data transmission to that specific link will be sent to the communication buffer. The problem is that data transmission to other links becomes impossible or is significantly delayed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data communication system that can efficiently transmit data while making effective use of memory.

[Means for Solving the Problems] According to the present invention, there is provided a data communication system in which an application processing device communicates via a communication management device connected to a first to an Nth link, wherein the communication management device includes a communication buffer getting means for getting one of a plurality of communication buffers provided in a memory, a data transmitting means for transmitting data using the communication buffer obtained by the communication buffer getting means, and a data transmitting means for transmitting data using the communication buffer obtained by the communication buffer getting means. In a data communication system having a communication buffer return means for returning a communication buffer after transmission is completed, the memory includes first to Nth communication buffers corresponding to the first to Nth links, respectively, and the first to Nth communication buffers. A plurality of common communication buffers capable of handling all of the N-th links are provided, and the communication buffer getting means transmits data to the n-th (1≦n≦N) link in response to a request from the application processing device. The data communication system is characterized in that when the n-th communication buffer is already obtained, one of the common communication buffers is obtained. can get.

[Example code] The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a block diagram of a data communication system according to an embodiment of the present invention.

This data communication system includes an application processing device (not shown, hereinafter referred to as application program 11) that processes an application program 11, a communication management device (not shown, hereinafter referred to as communication management program 12) controlled by a communication management program 12, a main memory 13
, a communication buffer generation device 14.

The communication management program 12 also includes a communication buffer getter 15, a data transmitter 16, and a communication buffer returner 1.
7, and the data transmitter 16 is connected to the first to Nth links.

Next, the operation of this data communication system will be explained.

First, the communication buffer generation device is activated and a communication buffer is provided on the main memory 13. The communication buffers include first to Nth dedicated communication buffers 31, 32, . . . corresponding to the first to Nth links, respectively. ..., 3N, and a plurality of common communication buffers 41 forming the communication buffer Boolean 40.
and is provided.

This will be explained below with reference to FIG.

In the above state, when a data transmission request signal is output from the application program 11, the communication buffer get unit 15 is activated in step 521.

The activated communication buffer get unit 15 performs step S2.
In step 2, for example, if it is a data transmission request to link 1, it is checked whether link 1 has a communication buffer 31 for link 1. (Here, the existence of a communication buffer in link 1 means that the memory location of the link January communication buffer is registered in the link control device (not shown).) 1, the communication buffer get unit 15 gets the communication buffer 31 for link 1 in step 52B. (If it is obtained, the registration of the link control device will be deleted.) Also, if the communication buffer 31 for link 1 does not exist in link 1, the common communication buffer 4 in the communication buffer Boolean
1 in step 523.

When the communication buffer 31 or 41 is obtained, the data sending fg section 16 is activated in step S24.

Then, the data transmitter 16 transmits data to the link 1 using the communication buffer 31 or 41 in step S25.

Next, the operation will be explained with reference to FIG.

When the data transmission from the data transmitter 16 is completed, the communication buffer return 817 is activated in step 531.

The activated communication buffer return unit 17 performs step S32.
Check whether a communication buffer exists on link 1.

If there is no communication buffer on link 1, the buffer 31 or 41 used for data transmission earlier is returned as the communication buffer 31 for link 1 in step 833. Also, if a communication buffer exists, buffer Boolean 40
The communication buffer 41 is returned to the common communication buffer 41. (In other words, the communication buffer that completed communication first among the used communication buffers is re-registered in the link control device as a dedicated communication buffer.) Finally, the communication buffer return means sends an end signal indicating that data transmission has ended. Application program 1
1 is output.

[Effects of the Invention] According to the present invention, the memory includes first to Nth communication buffers corresponding to the first to Nth links, respectively, and a plurality of communication buffers that can correspond to all of the first to Nth links. A common communication buffer is provided, and the communication buffer get means receives the nth (1≦n≦N
) when sending data to a link, the n-th communication buffer is obtained, and if the n-th communication buffer has already been obtained, one of the common communication buffers is obtained. Even if there is a plurality of data transmission requests from the processing device to the n-th link, the common communication buffer can be used to send no data, so the processing capacity is unlikely to deteriorate.

Also, by setting one communication buffer for each link and appropriately selecting the number of common communication buffers,
Memory can be used efficiently without securing unnecessary communication buffers in memory.

Furthermore, each link has one communication buffer.
Therefore, the communication buffer will not be occupied by multiple data transmission requests to a specific link.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart for getting a communication buffer, and FIG. 3 is a flowchart for returning a communication buffer. 11...Application program, 12...Communication management program, 13...Main memory, 14...
- Communication buffer 7 generation device, 15... Communication buffer get unit, 16... Data transmitting unit, 17... Communication <,
, Fa Return Department, 31, 32. ..., 3N... Dedicated communication Ikufa, 40... Communication buffer boolean, 41.
・・Common communication buffer 0 Figure 1 Figure 3

Claims (1)

[Claims] 1. The application processing device is the first to Nth (N is 2
A data communication system that performs communication via a communication management device connected to a link (an integer greater than or equal to A data communication system comprising a buffer getting means, a data transmitting means for transmitting data using the communication buffer obtained by the communication buffer getting means, and a communication buffer returning means for returning the communication buffer after data transmission is completed, The memory is provided with first to Nth communication buffers corresponding to the first to Nth links, respectively, and a plurality of common communication buffers that can correspond to all of the first to Nth links, The communication buffer getting means gets the n-th communication buffer when transmitting data to the n-th (1≦n≦N) link in response to a request from the application processing device;
A data communication system characterized in that when the n-th communication buffer has already been obtained, one of the common communication buffers is obtained. 2. In the memory, first to Nth communication buffers respectively corresponding to the first to Nth links, and a plurality of common communication buffers that can correspond to all of the first to Nth links are provided. 2. The data communication system according to claim 1, further comprising communication buffer generation means provided.