JPH0277844A - Program control system - Google Patents

Abstract

PURPOSE:To maintain the orderliness of an end state and to perform centralized control without paying attention to an execution program by storing responses from the execution program in an FIFO buffer in process end order. CONSTITUTION:The FIFO buffer F is provided for control between a user program P and three processing execution programs A, B, and C. The user program P generates requests to process the processing execution programs A, B, and C according to the contents of the program. A processing execution program receiving a processing request sends back a response to the FIFO buffer F after the processing. The FIFO buffer F outputs data in input order and the user program P can receives the responses in the order of the end of the processing execution programs.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a program control method, particularly a user program (
application program) and processing execution program (
This invention relates to a program control method during an operation program.

[Conventional technology]

This type of conventional program control system is an O8 system in which a user program controls multiple processing execution programs, such as a line printer, keyboard, disk device, etc.
If a user program issues a processing request to the ``Processing Request'' and terminates the processing at the same time, the completion information for all processing requests will be notified, but the processing order for these requests is up to the user program. It had been.

From the perspective of the above user program, simultaneous termination means termination while the user program is executing a certain process and before starting the next process.

[Problem to be solved by the invention]

In the conventional program control method described above, when a user program requests processing to multiple processing execution programs,
Multiple processing instructions are executed, and even if the user program receives notification of processing completion, it is not only impossible for the user program to know which processing instruction completed first, but also the instruction completion process becomes complicated. There is a drawback.

[Means to solve the problem]

The program control method of the present invention is set by a user program, and a FIFO buffer having a data storage pointer and a data retrieval pointer is provided, and the FIFO buffer is set by a user program, and the FIFO buffer is set by the user program, and the FIFO buffer is set by the user program. A notification of completion of processing for a processing request is stored in the FIFO buffer by the processing execution program according to the data storage pointer, and the user program retrieves data from the FIFO buffer according to the data retrieval pointer.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the present invention, in which a FIF buffer F is provided for control between a user program P and three processing execution programs A, B and C.

The user program P issues a processing request to each processing execution program A, B, and C according to the content of the program. The processing execution program that receives the processing request returns a response to the FIFO buffer F after executing the processing.

As is well known, the FIFO buffer F is configured to output in the order in which it is input, so the user program P is the processing execution programs A and B.

The response can be received in the order in which the processing in C is completed.

FIG. 2 is a diagram showing the detailed structure of the FIFO buffer F, in which there is a data section which is a data storage section and consists of multiple buffers, and data indicating the position of an empty buffer in the data section where data should be stored next. It consists of a storage pointer CLP, a data extraction pointer ELP indicating the position of the entry from which data should be extracted next, the number of entries N, and the buffer length.

Data storage pointer CLP and data retrieval pointer E
LP is indicated by a relative address from the first buffer in the data section, and the number of entries N increases or decreases by one in accordance with data storage and retrieval, respectively. Further, the buffer length can be freely set by the user program P.

FIG. 3 is a detailed diagram of the entry in FIG. 2, which consists of data, a function code ID indicating which processing execution program the data comes from, and a data length LNG.

FIG. 4 is a diagram for explaining the data storage process of the processing execution program, and FIG. 5 is a diagram for explaining the data retrieval process of the user program P.

Responses to processing requests issued by the user program P to a plurality of processing execution programs are sequentially stored in the FIFO buffer F by the processing execution programs according to the data storage pointer CLP.

The user program may extract and process the response according to the data extraction pointer ELP.

When the response is retrieved, the data retrieval pointer ELP moves as shown by the dotted line in FIG. 2, for example.

Note that it is also possible to notify the user program every time a response is stored, as specified by the user program.

〔Effect of the invention〕

As explained above, in the present invention, the response from the processing execution program to the processing request of the user program is
Since the data is stored in the FIFO buffer in the order in which the processing ends, the order of the end status is maintained, so the user program can
Data can be retrieved and processed one by one from the FO buffer, and even when processing is requested to multiple processing execution programs, it can be managed centrally without having to be aware of each processing execution program, and is also important as an operator interface. This has the effect that processing can be performed according to the ranking of certain data.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of the present invention, FIGS. 2 and 3 are detailed views of this embodiment, and FIGS. 4 and 5 are explanatory diagrams of the operation of this embodiment. P...User program, A, B, C...Process execution program, F...FIFO buffer, CLP...
Data storage pointer, ELP...data retrieval pointer, N...number of entries, L...buffer length, ID.
...Function code, LNG...data length.

Claims (1)

[Claims] A FIFO buffer set by a user program and having a data storage pointer and a data retrieval pointer is provided, and a FIFO buffer is provided for processing requests issued from the user program to a plurality of processing execution programs. A program control method characterized in that a processing end notification is stored in the FIFO buffer by the processing execution program according to the data storage pointer, and the user program retrieves data from the FIFO buffer according to the data retrieval pointer.