JPS60254328A - Task processing method in data processing system - Google Patents

Abstract

PURPOSE:To execute a job smoothly and efficiently by storing an event from another task in an event queue during the priority processing of a main task and taking out the event after the end of the priority processing. CONSTITUTION:When error information is outputted from a circuit control task A to a working task B during the execution of communication, the working task B sends an error information reading macro-instruction to a floppy disc control task D to write the error information in a floppy as the priority processing. After the starting of said priority processing, the event sent from the task A to the task B is successively stored in a queue, i.e. a terminal T, formed in the task B. After the end of writing of the error information and the end of the priority processing, the queue is retrieved, and when the information is stored in the queue, the information is successively taken out from the leading buffer of the queue and sequentially processed.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial field of application The present invention relates to a method for processing tasks, particularly for processing tasks that are received during priority processing.
The present invention relates to a task sequential processing method that suspends events that have reached 1000 digits, and allows sequential processing of events after the above-mentioned priority processing is completed.

In a system where multiple jobs consisting of multiple tasks are connected and controlled in parallel, these jobs are sent to the central processing unit @ (CPLJ) through an interface.
, and is controlled by Tanabata of the operating system (O8) via the interface to perform priority processing control and ζ standby control for the task. However, such advanced functions belong to a large-scale control device, and it is difficult or inadvisable to control these advanced functions using a monitor of a small-scale control device due to the balance of the overall system configuration. The present invention attempts to control tasks in such a small-scale control device.

(2) Prior Art FIG. 1 is a diagram showing a conventional task processing procedure. In this figure, B corresponds to the main task and is a business program. A, C, and D are subtasks, and A
The task is a line control program, the C task is a display/keyboard control program, and the D task is a floppy disk control program. In the conventional example, main task B receives a request from one receiving unit (RCV) subtask and performs processing based on this request. That is, the request information from the subtasks is extracted in the order in which it was received according to the programming order and is sequentially processed. In such a case, if the information that you want to process with priority is in D, and the information from task C or A is input to main task B first, main task B will
The information received from task C and the information from task 8 are processed.

FIG. 2 shows how information is exchanged between each task. In this figure, business task B receives a request macro "1 pass" (for example, a request to send a document) from display/keyboard control task C, and sends a "line open" macro to line control task A. Next, after receiving the open completion message from the line control task A, the business task B sends a "data read (READ') macro" to the floppy disk control task D to read the document data. This causes the exchange of 112 II and "3" in FIG. This series of document transmission processing should be performed until the document transmission completion notification indicated by "6" is completed, but an error message is sent from line control task A to business task B in the middle of the communication to send the II 4 n macro. It is assumed that Notice 117 II has been issued. When business task B receives this error notification, it closes the line (
CLO8E) processing begins, but in order to save the error information to the floppy disk, sends the error information statement (WR, ITE) J macro to the floppy disk control task D and then completes the process. The process of writing this error information onto the floppy disk is given priority.゛(3) Problems that the invention seeks to solveHowever,
In the conventional task processing method described above, in which the business task B is received only at one place during the business process, during the priority processing, the line control task A or
Further error information #8. jl,
419 II. Even if “'10°” is sent, business task B is still in priority processing, so the above information “'8″,
"19 II, '1"10" is skipped and cannot be processed even though it should have been processed after the priority processing is completed. Also, business task B is internally disabled while processing various information. Since the state of the line control task also changes, it may become impossible to accept events from the line control task.

(4) Means for Solving the Problems The present invention has been made by focusing on the above-mentioned problems, and its purpose is to provide information between tasks even in small-scale control devices that do not have a high-level monitoring function. The purpose is to give priority to exchanges while also processing other task information received during priority processing without ignoring it, so that job execution can be performed smoothly and efficiently. It is something to do.

- In order to achieve such an object, the present invention provides a data processing system that has a main task and subtasks and exchanges information between them, by creating an event queue for the subtask in the main task, and A macro for priority processing is set up between a task and a specific task, and while the priority processing is being performed, events sent from other tasks are saved in the event queue, and after the priority processing is completed, the events are The gist of the system is to sequentially retrieve and process events stored in a queue.

(5) Action For example, work that is the main task! If an event is sent from line control task A while task B and floppy disk control task D are exchanging information through priority processing, the event is stored in the event queue set for business task B. Stored (reserved) in supplies. During this time, business task B and floppy disk control task D continue to perform priority processing.

Then, after this priority processing is completed, the stored events are retrieved from the event queue in the order in which they were received and sequential processing is performed.

(6) Embodiment FIG. 3 shows an embodiment of the present invention. In the data processing system shown in this figure, a queue or terminal T is provided in business task B, and a queue or terminal T is provided between business task B and display/keyboard control task C1 or floppy disk control task D. A standby macro between line control task A and business task B is set for the priority processing macro. This queue is provided in the data section of business processing task B, and as shown in FIG. 4, consists of a head pointer, a tail pointer, and a buffer (BF') addressed by these pointers to which events are written and read. configured.

The head pointer is used to indicate the address of the first buffer door, and the tail pointer is used to indicate the address of the last buffer 1.

Buffer BF is used for exchanging information (SEND) between each task.
/RCV).

A plurality of buffers are connected in a chain, and each 'buffer is provided with an address indicating section (N, P) indicating the address of the next connected buffer 1. Note that II OII is written in the address instruction section of the final buffer. During priority processing, when a buffer such as a pending macro is received, it is connected to the last stage of the queue.

After the priority processing is completed, the buffers in the queue are sequentially taken out from the beginning, ie, they are processed in order (first-in, first-out).

Therefore, in such a data processing system, priority processing is performed as follows.

(a) The operator inputs "Document transmission request" on the keyboard (display/keyboard control task C processing).

(b) A transmission request macro is sent to business task B from display/keyboard control task C.

(c) A "line open" macro is sent to line control task A from business task B.

(d) Business task B sends a ``data read macro'' from line control task A to floppy disk control task D after receiving the line OEM termination, and reads the document data.

(E) - During the communication described in F, line control task A sends an error notification to business task B, and business task B receives this and enters line closing processing. In order to obtain the above information, send the ``1 error information read'' macro to the floppy disk control task D and have it complete.

Then, the process of writing this error information onto the floppy disk is set as a priority process. After entering this priority processing, events sent from line control task 8 to business task B, such as other error information, are sequentially held in a key provided in business task B. To write the error information, a macro sent from business task B to floppy disk control task D opens error information file 1 and writes data into this file. After the day and evening writing is completed, the error information file is closed.
Priority processing ends. When this priority processing is completed,
When a search is performed on a queue and information is held there, the information is sequentially taken out from the head buffer of the queue and sequentially processed. Therefore, data processing that should have been performed after priority processing is not skipped as in the past, and jobs can be executed smoothly. FIG. 5 shows the above-mentioned series of task processing operations as a macro sequence, and FIG. 6 is a flowchart 1 to 1 showing the procedure for creating a queue when there is a priority process. Note that in the above explanation, the queue is provided to hold events from the line control task Δ, but it may also be set to hold events from other tasks, or multiple queues may be prepared to hold events from multiple tasks. It may also be possible to suspend events from.

(7) As described in detail, according to the present invention, in a data processing system constituted by a plurality of tasks, an event queue is provided for the main task, and the event queue is provided for the main task so that other tasks that are being processed with priority Since the events from 1 to 3 are held in the event queue and can be retrieved after priority processing is completed, information necessary for data processing will not be skipped, making it possible to perform jobs smoothly and efficiently.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing the configuration of a conventional data processing system, FIG. 2 is a diagram showing an example of data processing operation in the conventional system, and FIG. FIG. 4 is a diagram schematically showing the configuration of the data processing system used, FIG. 4 is a diagram schematically showing the configuration of the queue used in the above embodiment, and FIG. 5 is a clear macro seek example of the data processing operation in the above embodiment. Figure 6
The figure is a flowchart showing the queue creation procedure during data processing operation of the above embodiment. Δ...Line control task (subtask) B...Business task (main task) C...Display/floppy control task (subtask) 1)...Floppy disk control task (subtask) King...Queue (Terminal) BF...Buffer Figure 1 Figure 2

Claims (1)

[Claims] In a data processing system that consists of a main task and multiple subtasks, and in which information is exchanged between the main task and the subtasks, the main task is provided with an event queue for the subtasks, and the main task is configured to communicate with a specific task. We created a priority processing macro to hold events sent from other tasks in the event queue while performing priority processing, and after the priority processing was completed, we took them out of the event queue and processed them sequentially. A method of processing tasks in a data processing system.