JPH02257225A - Buffer managing device for computer system - Google Patents

Abstract

PURPOSE:To timely and effectively utilize a buffer by storing in advance a user and the number of request buffers as a buffer request queue in a management table, and giving a notice to a buffer user when a free buffer is generated. CONSTITUTION:A buffer obtaining means 2 obtains a buffer from a buffer pool 8 by a request from a buffer user 1. A buffer obtaining result deciding means 3 decides the result of obtainment of the buffer by this buffer obtaining means 2, and when the buffer cannot be obtained, a result informing means 4 registers the user 1 and the number of buffer requests in a management table 9 and informs whether they are registered or not to the buffer obtaining request person 1. When they are registered, a buffer request waiting deciding means 6 retrieves the management table 9 and unless there is the request waiting concerned, a request person informing means 7 informs a fact that the buffer can be obtained to the buffer user 1. On the other hand, when a buffer release request is executed from the buffer user 1, a buffer releasing means 5 releases the buffer to the buffer pool 8. In such a manner, the utilization efficiency of the buffer is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to a computer system. The present invention relates to a buffer management method for acquiring necessary buffers from a buffer pool in response to requests from a plurality of users.

〔overview〕

The present invention provides a buffer management method for a computer system that acquires buffers from a buffer pool in response to requests from multiple buffer users and releases the buffers to the buffer pool when they are no longer needed. By storing the users and the number of requested buffers as a buffer request waiting queue and notifying the buffer users when an empty buffer occurs, the buffers can be used in a timely and effective manner.

[Conventional technology]

Conventional buffer management methods that extract necessary buffers from a buffer pool based on requests from multiple users set a threshold value for the buffer, and notify users that they cannot extract the buffer if the threshold is exceeded. The user either goes to get the buffer until the buffer is available, or waits until the first buffer user in the waiting state is notified that the buffer is free.

[Problem that the invention seeks to solve]

In the conventional buffer management method described above, a user who cannot acquire a buffer periodically retries, which wastes CPU calculation time, and when a buffer becomes available, the first buffer user waiting is Since the notification method did not take into account the number of buffers requested by the user, there was a problem in that the user could not obtain buffers even after notification.

The present invention solves this problem by storing the number of buffers requested by the user in a buffer request waiting queue when a buffer cannot be obtained, and when a free buffer becomes available, the buffer that has been waiting for a long time is saved. The purpose of this invention is to provide a buffer management method that enables timely and effective use of buffers by notifying users who can acquire them.

[Means for solving problems]

The present invention includes a buffer acquisition means for acquiring necessary buffers from a buffer pool in response to requests from a plurality of buffer users, and a buffer release means for releasing buffers from the buffer users to the buffer pool when they are no longer needed. In the buffer management device of a computer system, a management table is provided for registering the number of used machines and the number of buffer requests, and a buffer acquisition result determination means for determining the acquisition result by the buffer acquisition means, and a buffer acquisition result determination means for determining the acquisition result by the buffer acquisition means, and a buffer acquisition result determination means for determining the acquisition result by the buffer acquisition means, a result notification means for registering the user and the number of buffer requests in the management table and notifying the buffer user of the denial; and a result notification means for notifying the buffer user of the denial; The present invention is characterized by comprising a buffer request waiting determination means for determining whether or not a buffer is available, and a buffer requester notification means for notifying a buffer user that the buffer has been acquired when the buffer has been acquired.

[Effect]

The buffer acquisition means receives a request from a buffer user.
Get a buffer from the buffer pool.

The buffer acquisition result determination means determines the buffer acquisition result by this buffer acquisition means, and when the buffer acquisition result is not obtained, the result notification means registers the user and the number of buffer requests in the management table, and determines whether or not the user is registered as a buffer acquisition requester. to notify you of If it is registered, the buffer request waiting determination means searches the management table and determines whether or not there is a corresponding request waiting, and if there is no request waiting, the requester notification means notifies the buffer user that the buffer has been acquired. Notice.

On the other hand, when a buffer user requests to release the buffer, the buffer release means releases the buffer to the buffer pool.

As a result, a user who is unable to obtain a buffer does not have to retry periodically, which prevents wastage of the CPU, ensures notification to the buffer requester, and improves buffer usage efficiency.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

The embodiment of the present invention includes a buffer acquisition means 2 that acquires a necessary buffer from a buffer pool 8 in response to a request from a plurality of buffer users 1, and a buffer acquisition means 2 that acquires a necessary buffer from a buffer pool 8 in response to a request from a plurality of buffer users 1, and a buffer that acquires a buffer from a buffer user 1 to the buffer pool 8 when it is no longer necessary. A buffer release means 5 for releasing the buffer, a management table 9 for registering users and the number of buffer requests are provided, a buffer acquisition result determination means 3 for determining the acquisition result by the buffer acquisition means 2, and a buffer acquisition result determination means 3 for determining the acquisition result by the buffer acquisition means 2; A result notification means 4 registers the user and the number of buffer requests in the management table 9 and notifies the buffer user 1 of the denial, and when a buffer is released, the management table 9 is searched and the request waiting for the corresponding buffer is checked. FIG. 2 shows an embodiment of the present invention, which includes a buffer request waiting determination means 6 for determining whether or not a buffer is available, and a buffer requester notification means 7 for notifying the buffer user 1 that the buffer has been acquired when the buffer has been acquired. 3 is a flowchart showing the processing flow of the buffer acquisition means 2 in the example. The buffer acquisition means 2 performs request buffer number acquisition processing (step 21), buffer acquisition processing (
Step 22), buffer acquisition result determination means activation process (
Execute step 23).

FIG. 3 is a flowchart showing the processing flow of the buffer acquisition result determining means 3 according to the embodiment of the present invention. The buffer acquisition result determination means 3 performs buffer acquisition determination processing (step 31), normal notification instruction processing (step 32), result notification means activation processing (step 33), and management table registration processing (step 3).
4) Execute abnormality notification instruction processing (step 35).

FIG. 4 is a flowchart showing the processing flow of the result notification means 4 according to the embodiment of the present invention. The result notification means 4 performs requester result notification processing (step 41).

FIG. 5 is a flowchart showing the processing flow of the buffer release means 5 according to the embodiment of the present invention. The buffer release means 5 performs a release buffer number acquisition process (step 51) and a buffer release process (step 51).
Step 52) is executed.

FIG. 6 is a flowchart showing the processing flow of the buffer request waiting determination means 6 according to the embodiment of the present invention. The buffer request waiting determination means 6 executes a management table search process (step 61), a management table end determination process (step 62), a management table search determination process (step 63), and a buffer requester notification means activation process (step 64). .

FIG. 7 is a flowchart showing the processing flow of the buffer requester notification means 7 according to the embodiment of the present invention. The buffer requester notification means 7 performs requester result notification processing (step 71).

Next, the operation of the embodiment of the present invention configured as described above will be explained.

When the buffer user 1 who needs a buffer instructs the number of requested buffers, the buffer acquisition means 2 starts.
In the requested buffer number acquisition process (step 21), the user's requested number of buffers is obtained. Buffer acquisition processing (step 22
) to acquire as many buffers as the number of buffers requested from the buffer boolean, and execute the buffer acquisition result determination means activation process (
In step 23), the buffer acquisition result determining means 3 is activated.

The buffer acquisition result determination means 3 determines whether or not the result of the buffer acquisition process in step 22 is successful in a buffer acquisition determination process (step 31). If successful, a normal notification instruction is performed to notify the buffer requester of the result in a normal notification instruction process (step 32). Next, the result notification means 4 is activated in a result notification means activation process (step 33).

If it fails, the management table registration process (step 34)
), the number of requested buffers is 82 in the management table 9 shown in FIG.
and the user 83, and perform the abnormality notification instruction process (step 3).
In step 5), an abnormality notification instruction is given to notify the buffer requester of the result.

The result notification means 4 performs requester result notification processing (step 41
) to notify the requester of the results.

The buffer release means 5 acquires the number of released buffers in the release/release buffer number acquisition process (step 51), and returns the buffer to the buffer pool in the buffer release process (step 52).

The buffer request waiting determination means 6 determines the request status of buffers based on the number of requested buffers 82 in the management table 9 shown in FIG. Find users. Next, management table end determination processing (step 62)
It is determined whether or not the management table 9 has been processed to the end. If it is finished, this process is finished. If the search has not been completed yet, a management table search determination process (step 63) is performed to determine whether a corresponding table has been found. When a corresponding table is found, the buffer requester notification means 7 is activated in a buffer requester notification means activation process (step 64). After that, management table search processing (step 61)
Return to

The buffer requester notification means 7 instructs the buffer requester to notify the buffer availability in the requester result notification process (step 71).

As mentioned above, for example, if the number of released buffers is 10, user A registered in the management table 9 has 15, and user B has 5.
, user C is 4, user R is 8, and user E is 2, then users B and C will be notified of availability.

〔Effect of the invention〕

As explained above, according to the present invention, a user who is unable to acquire a buffer does not have to periodically retry, so the processing calculation time of the CPU is not wasted, and
When a buffer becomes available, the number of buffers requested by the user is stored in the buffer request waiting queue, so the buffer requester can be reliably notified and the efficiency of buffer usage can be increased. There is.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a flowchart showing the processing flow of the buffer acquisition means according to the embodiment of the present invention. FIG. 3 is a flowchart showing the processing flow of the buffer acquisition result determining means according to the embodiment of the present invention. FIG. 4 is a flowchart showing the processing flow of the result notification means according to the embodiment of the present invention. FIG. 5 is a flowchart showing the processing flow of the buffer release means according to the embodiment of the present invention. FIG. 6 is a flowchart showing the processing flow of the buffer request waiting determination means according to the embodiment of the present invention. FIG. 7 is a flowchart showing the processing flow of the buffer requester notification means according to the embodiment of the present invention. FIG. 8 is a diagram showing the management table 9 according to the embodiment of the present invention. 1... Buffer user, 2... Buffer acquisition means,
3... Buffer acquisition result determining means, 4... Result notifying means, 5... Buffer release means, 6... Buffer request waiting determining means, 7... Buffer requester notifying means, Death... Buffer Boolean, 9... Management table.

Claims (1)

[Claims] 1. Buffer acquisition means for acquiring necessary buffers from a buffer pool in response to requests from a plurality of buffer users, and releasing buffers from buffer users to the buffer pool when they are no longer needed. A buffer management device for a computer system, comprising: a management table for registering users and the number of buffer requests; buffer acquisition result determination means for determining an acquisition result by the buffer acquisition means; result notification means for registering the user and the number of buffer requests in the management table and notifying the buffer user of the denial; A computer comprising: buffer request waiting determination means for determining whether there is a request waiting; and buffer requester notification means for notifying a buffer user that the buffer has been acquired when the buffer has been acquired. System buffer management device.