JPS62134728A - Inter-program data transferring system - Google Patents

Abstract

PURPOSE:To reduce a load on a central processor, and to improve the efficiency of a memory by shortening the time required for transferring a data, by providing a buffer area managing means, a buffer allocation request means, a transfer means, and a buffer release request means. CONSTITUTION:When a segment descriptor is informed from a buffer area managing means 4, a buffer allocation request means 1 informs it to a data transmitting program 6. The data transmitting program 6 processes a data on a buffer 31, and delivers the segment descriptor to a transfer means 5. When the segment descriptor is received from the data transmitting program 6, the transfer means 5 informs it to a data receiving program 7. When the segment descriptor is received from the data receiving program, a buffer release request means 2 requests to the buffer area managing means 4 so that the buffer 31 corresponding to its segment descriptor is released. When this request is received, the buffer area managing means 4 updates the contents of a management table so that the buffer 31 which is expressed by the segment descriptor remains unused, and executes a buffer release processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transfer method between programs in a data processing system.

[Conventional technology]

Conventionally, when transferring data between programs, the maximum size of the data to be transferred is determined using a predetermined method, and a buffer of a size larger than the maximum size is created on both the data receiving program side and the data sending program side. After preparing one program, the data transmission program was carried out by copying the data in the buffer on the one-gram side to the buffer on the data reception program side.

[Problems to be Solved by the Invention] However, the conventional double-copy method has the problems of increasing the load on the central processing unit and taking a long time to transfer data because it is necessary to copy the data. , since the data receiving program side also needs to lift the buffer, the memory efficiency is poor and the data receiving program (Δ
There was a problem in that a procedure for determining the maximum size of the buffer was also required on the program side.

The present invention solves these conventional problems, and its L1 purpose is to reduce the load on the central processing unit of a data processing system when transferring data between a data sending program and a data receiving program. In addition, it is an object of the present invention to provide a method that requires less time for transfer and has excellent memory efficiency.

[Means for solving problems]

The inter-program data transfer method of the present invention is an inter-program data transfer method between a data sending program and a data receiving program in a data processing system that can refer to virtual memory space in segment units. buffer area management means for managing the allocation status and generating a segment descriptor representing the allocated buffer; and requesting the buffer area management means to allocate a buffer of a size requested by the data transmission program from the buffer area. ,
buffer allocation request means for obtaining a segment descriptor generated by the buffer management means in response to the request; and data processing is performed on the buffer represented by the segment descriptor obtained by the buffer allocation request means. a transfer means that receives a segment descriptor of a buffer that has undergone transmission processing from a data sending program and transfers the received segment descriptor to a data receiving program; Buffer release request means receives a segment descriptor of a buffer that has been processed (ε) from a data receiving program that has processed data, and requests the buffer area management means to release the buffer represented by the segment descriptor. be done.

(Operation) When transferring data from a data sending program to a data receiving program, a buffer of the size required for data transfer by the data sending program is allocated from a pre-prepared buffer area, and a segment description expressing this allocated buffer is created. A child is generated by the buffer area management means. After processing the data on the buffer represented by this generated segment descriptor, the data sending program notifies the data receiving program of the pigment descriptor by the transfer means. After receiving this notification, the data receiving program processes the data in the buffer represented by the notified segment descriptor, and then uses the buffer release request means to release the buffer represented by the segment descriptor to the buffer area management means. make demands on

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which the present invention is applied to a data processing system that can refer to virtual memory space in units of segments.

As shown in the figure, the inter-program data transfer method of this embodiment includes a buffer allocation requesting means 1, a buffer release requesting means 2, a buffer area 3 allocated to a part of the virtual memory space, and a buffer area management means. 4 and transfer means 5
, a data transmission program 6, and a data reception program 7.

The buffer area management means 4 includes a buffer allocation request means l.
When there is a request from , a buffer of a size commensurate with the requested size is cut out from buffer area 3, and a segment descriptor representing that buffer is generated. For example, when the buffer part is updated while it is in use, and there is a request from the buffer release request means 2, the buffer area is updated, for example, by updating the contents of the management table corresponding to the buffer of the requested segment descriptor to unused. Perform management.

Note that as the segment descriptor, for example, a descriptor consisting of a heath address and a size can be used.

The buffer allocation requesting means 1 is a data transmission program 6
Processing of requesting the buffer area management means 4 to cut out a buffer of the requested size from the buffer area 3, and notifying the request source data transmission program 6 of the segment descriptor generated by the buffer area management means 4. Process.

When the transfer means 5 receives a request from the data transmission program 6 that has performed data processing on the buffer represented by the segment descriptor obtained by the buffer allocation request means 1,
It receives the segment descriptor of the buffer that has been sent and transfers it to the data receiver (Prograno 8, 7).

When receiving a request from the data receiving program 7 that has processed data on the buffer represented by the segment descriptor transferred by the transfer unit 5, the buffer release requesting unit 2 releases the segment descriptor of the buffer that has undergone the reception processing into data. It receives it from the receiving program 7 and performs processing to request the buffer area management means 4 to release the buffer represented by the segment descriptor.

Next, the operation when transferring data between programs will be explained with reference to FIG.

Data transmission is performed as follows. That is, when data to be transferred is generated, the data transmitting programmer 1, 6 first determines the size of the buffer necessary for data transfer, and issues a request to the buffer allocation requesting means 1. When receiving this request, the buffer allocation requesting means 1 requests the buffer area management means 4 to cut out a buffer of a size commensurate with the size requested by the data transmission program 6 from the buffer area 3 and notify the segment descriptor thereof. do. In response to this, the buffer area management means 4 first refers to the contents of the management table, cuts out a buffer of a size commensurate with the requested size from the unused portion, for example, the buffer 31 in FIG. After registering in the management table, the buffer 31
A segment descriptor representing the segment descriptor is generated and notified to the buffer allocation requesting means l.

The buffer allocation requesting means 1 is the buffer area management means 4.
When the segment descriptor is notified from , it is notified to the data transmission program 6 . When the data transmission program 6 receives this notification, it processes the data on the buffer 31 represented by the segment descriptor, and when this processing is completed,
The segment descriptor is passed to the transfer means 5.

When the transfer means 5 receives the segment descriptor from the data transmission program 6, it notifies the data reception program 7 of this.

When the data reception program 7 receives a segment descriptor from the transfer means 5, it processes the data on the buffer 31 represented by the segment descriptor, and when the processing is completed, it sends the segment descriptor to the buffer release request means 2. hand over.

When the buffer release requesting means 2 receives the segment descriptor from the data receiving program, the buffer release requesting means 2 sends the segment descriptor to the buffer area management means 4.
, the buffer 31 corresponding to the segment descriptor
request to be released.

C.7 The buffer area management means 4 is the buffer release requesting means 2.
When there is a request from , the contents of the management table are updated so that the buffer 31 represented by the segment descriptor is unused, and buffer release processing is executed.

In the above embodiments, data transfer between one data transmission program 6 and one data reception program was taken as an example, but the present invention also applies to data transfer between a plurality of data transmission programs and a plurality of data reception programs. is applicable. In that case, the buffer allocation request means 1 is connected to a plurality of data transmission programs, the buffer release request means 2 is connected to a plurality of data reception programs, and the transfer means 5 is connected to a plurality of data transmission programs. , and is connected to the data receiving program. Also, the data transmission block r1
The program passes the segment descriptor along with the purpose of use of the buffer represented by the segment descriptor to the transfer means,
The transfer means places the segment descriptors in different queues for each purpose of use, takes out segment descriptors that match the purpose of use requested by the data receiving program from the queue, and sends them to the data receiving (δ program). A configuration such as 15: passing is used.

〔Effect of the invention〕

As explained above, according to the present invention, since the buffer area management means, buffer allocation request means, transfer means, and buffer release request means are provided, the following effects can be obtained.

■ There is no need to copy data as in the past, so the central processing unit 1! The load can be left light.

- Since there is no need to copy data, the time required for data transfer can be reduced by 11d.

■ Memory efficiency is improved because there is no need to prepare a buffer on the data receiving program side.

■ Since there is no need to provide a buffer on the data receiving program side, the procedure for determining the maximum size of the buffer can be omitted.

■ The buffer allocated for data transfer between the data sending program and the data receiving program is released upon request by the buffer release request means when the data transfer is completed, and the released buffer is used by other data sending programs, etc. It can be used for data transfer, and the limited buffer area can be shared by a large number of data sending programs and data receiving programs, further improving memory efficiency.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. In the figure, l is a buffer allocation requesting means, 2 is a buffer release requesting means, 3 is a buffer area, 4 is a buffer area management means, 5 is a transfer means, 6 is a data transmission program,
7 is a data receiving program.

Claims (1)

[Scope of Claims] In a data processing system that can refer to virtual memory space in units of segments, in an inter-program data transfer method between a data sending program and a data receiving program, the allocation status of a buffer area prepared in advance is managed. and requesting the buffer area management means to allocate a buffer of a size requested by the data transmission program from the buffer area;
a buffer allocation requesting means for acquiring a segment descriptor generated by the buffer management means in response to the request; and data processed on the buffer represented by the segment descriptor acquired by the buffer allocation requesting means. a transfer means that receives a segment descriptor of a buffer that has been sent from a sending program and transfers the received segment descriptor to a data receiving program; buffer release request means for receiving a segment descriptor of a buffer that has undergone reception processing from the data reception program that has performed the processing, and requesting the buffer area management means to release the buffer represented by the segment descriptor; A program-to-program data transfer method featuring: