JPS5878237A - Data transfer processing switching method - Google Patents

Abstract

PURPOSE:To switch the data transfer efficiently, by dividing a data transfer program from the start to the end of procedures into sections, between which input/output requests and end interrupts are permitted, and storing them in a memory and preparing the task control block for every dividing program. CONSTITUTION:A program P1 of data transmission procedures from the start to the end is divided into processings 1-5, and divisions of processings 1-5 are connected by input/output requests and input/output ends. A configuration table 5 indicating the use state of every port is prepared for every port of the program P1, and a task control block pointer 6 is set to each table 5. A processing 9 to be next executed and minimum information 8 indicating processing procedures are stored in a task control block 7. A CPU refers to the pointer 6 of the table 5 to detect the block 7 to be next processed, and the next processing is executed on a basis of the processing 9 of contents of the block 7, thus switching the data transfer efficiently and properly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a data transfer section 11 using an i-microcombinator, and more specifically, to the problem of how quickly to switch between a data transfer program and another program. The answer concerns the method of switching data transfer locations.

Technical Background of Data Transfer Section II in Microcombi System
In this case, the execution management module of the microcombi tool can adopt a method of distributing the CPU usage rights according to the situation, that is, as shown in Figure 1 (CPU distribution module).
However, each time an interrupt occurs, the CPU is distributed to the corresponding processing programs 2, 3, and data transfer program 4, for example.

With this method, as shown in Figure 2, when the input/output end interrupt I occurs during the execution of the data transfer processing program,
State save 1 of the interrupted data transfer program is represented. Next, after the input/output end basic processing is performed and the above-mentioned interrupt is responded to, the CPU usage right for the input/output end data transfer program is recovered.Furthermore, data transfer programs are selected to distribute the CPU. will be carried out. Then, the 9 data transfer program selected and the 4 program 0 state return (2) are performed, and data transfer processing is performed.

Furthermore, when an input/output request is made, basic processing is performed to start the input/output card for the input/output request from the data transfer program currently being executed, and the CPU usage rights are released until the input/output of the program is completed. The Qin process (■) is performed, and the program state is saved (■).

Problems with the Background Art Even with such a conventional method, when there are many programs each having a long processing procedure, the O8 (operating system) overhead required for program switching can be ignored.

However, in normal microcomputer systems, there are many input/output processes related to printers and buses that do not use the DMA method due to the cost (1%).In such input/output processing, the CPU is used to process each byte. Because it will be done%
Each time a 1-byte input/output request and its completion interrupt occur,
The above-mentioned OS overhead occurs.

Variantly, data transfer program P like the person in Figure 3
1 exists, it is divided into Processing ■, Processing ■, Processing ■, Processing ■, Processing ■, respectively, as shown in Figure 3B, and an input/output request and termination processing interrupt each division. It is thought that In such a case, process as shown in Figure 3 C.
It is considered that there is an OS overhead OH due to the input/output request and the termination request (m* request) for each delimiter (2).

Therefore, when executing a data transfer procedure program that exclusively performs input/output processing, this switching method has the drawback of being extremely inefficient.

OBJECT OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and its purpose is to efficiently switch and perform data transfer procedures.

SUMMARY OF THE INVENTION Accordingly, in the present invention, the process of a data transfer program from the start to the end of the procedure is divided into a plurality of areas in which input/output requests and input/output end interrupts are allowed and stored in the memory. Furthermore, a configuration table for indicating the usage status of input/output ports and a task control block for each data transfer program are prepared.

Then, each time the data transfer program is started and an input/output request is made, a pointer to the task control block to be executed is set in the configuration table as part of the basic input/output processing, and the task control block is set to the next division to proceed to. Sets information indicating the data transfer procedure performed. Next, when an input/output end interrupt occurs, the data transfer procedure is processed by referring to the pointer and task control block information set in the table described above. In this way, the data transfer process is switched by K.

Embodiments of the Invention Hereinafter, embodiments of the present invention will be described with reference to the drawings. #I
In FIG. 4A, Pi indicates a program for data transfer procedures. This program P1 processes as shown in FIG. 4B.
It is assumed that the area is divided into (3) and @C inclusion is allowed for each area.

Then, in am terms, as shown in Figure 4 C, processing ■ and processing ■,
The breaks between Processing ■, Processing ■, and Processing ■ are connected by an input/output request and an input/output end.

Specifically, like g5vAA, a table 5 is prepared for each port indicating its usage status. Well, if...
For a system with 10 input/output ports, 10 configuration tables are prepared.

This table 5 contains the task control block pointer 6.
is set to indicate which task control block described below is being used. The task control block 7 in Figure 5B is provided for each data transfer procedure program, and its contents are as follows: A minimum amount of information 8 is stored to indicate one of the processing steps, from process (1) to process (2), and from process (2) to process (2), which continues sequentially from process (2) to process (2). The task control block 7 also has an area in which information 9 indicating which process to proceed to next among the processes 1 to 2 described above is set.

As described above, when the data transfer procedure program P1 is started, the minimum information 8 indicating the processing procedure is stored in the task control block 7 of the memory.

Next, at the end of process (2) of the data transfer procedure program, an input/output request is made.

Therefore, the basic input/output processing based on this input/output request is performed by the CP.
As part of this basic processing, a 1-task control block pointer 6 is set in the input/output port configuration table 5 to indicate which task control block is employed. Furthermore, information on the next process to be executed from the lowest information 8 indicating the processing procedure (number ■)
, and set the information to proceed to this process (2) in the information 9 area.

Since one process for an input/output request has been completed, the CPU is used for rounding up other interrupt processes distributed to other programs.

Then, when the processing for the above-mentioned input/output request is completed and an input/output end interrupt occurs, the CPU refers to the pointer 6 from the configuration table 5, detects the task control block 7 to be processed next, and based on the contents, the CPU Refers to the information 9 in the control block 7 that indicates the next process to proceed to, and determines that it should proceed to process (2).
In response to an input/output request again, basic input/output processing including setting a pointer to the configuration table 5 described above and setting processing information in the task control block 7 is performed.

Below, a series of data transfer procedure programs 2 are carried out in the torture chamber and completed in the same manner.

As described above, in this embodiment, the OS overhead that conventionally existed in processing 1 to 2 is extremely reduced, and data transfer efficiency is improved.

Effects of the Invention In other words, according to the present invention, as shown in FIG. 6, only the input/output end interrupt processing ill and the input/output start basic processing by requesting the next input/output remain and are removed from other FiOS. In particular'
Ru. As a result, % ■ Program selection in CPU distribution processing and program state restoration ■ Relinquishment of CPU usage rights at the end of input/output and state preservation θ Input of state preservation of the interrupted data transfer procedure when an interrupt occurs There is no need for recovery of the right to use the CPU at the end of output, and by eliminating this overhead, the CPU can be used for its original work. As a result, it is guaranteed that data transfer processing switching is performed optimally and efficiently.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing the CPU distribution between the microcombi device and the CPU, Fig. 2 is a flowchart of the conventional example, Fig. 1g3 is a conceptual diagram showing the processing of the conventional example, and Fig. 4 is a conceptual diagram showing the processing of the conventional example. FIG. 5 is a conceptual diagram showing the processing by IK, FIG. 5 is a block diagram for explaining the present invention in detail, and FIG. 6 is a flowchart showing the processing according to the present invention. 5... Configuration table 7... Task control block substitute Shioiri Patent Attorney Book 1) Takashi Figure 1 Figure 2 Figure 3 (C) Figure 4. . ) Figure 5 (A) CB) Figure 6

Claims (1)

[Claims] A configuration in which a data transfer program procedure from the start to the end is divided into a plurality of K areas that allow input/output requests and input/output end interrupts, and the usage status of each port is indicated. A table and a task block that controls the processing procedure are prepared, and each time the data transfer program is started and an input/output request is made, the level of any task control block is added to the configuration table as part of the basic input/output processing. Set this as a task control block pointer, set information indicating the divided data transfer procedure to proceed to next in the task control block, and transfer the data by referring to the pointer and information by the next input/output end interrupt. A data transfer processing switching method that performs