JPH0415735A - Buffer control system - Google Patents

Abstract

PURPOSE:To prevent a use-up fault of a buffer due to the wrong release of buffers and the misrelease of buffers which are caused the buffers of different owners after the transfer of buffers by controlling the buffer owners and the buffer occupied time. CONSTITUTION:A buffer control module 1a records the identifiers of the information processing modules 3 and 4 that acquired the buffers and the control information on the buffer occupied time, etc. When a buffer that exceeds occupied time is detected in collation with the control information, this buffer is forcibly released to a buffer loop 2 as a defective buffer and then used for exchange of information in a low level of priority. Thus the defective buffer that is forcibly released to the loop 2 can be effectively used. Thus it is possible to evade such a case where the buffers are short due to fact that the buffers transferred to other modules are released by mistake or the buffers acquired or received form other modules are misreleased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a buffer management method used for exchanging information between information processing modules.

(Prior Art) FIG. 3 is a system configuration diagram implementing a conventional buffer management method used for information exchange between communication information processing modules. In the figure, (1) is a buffer management module;
(2) is a buffer pool, (3) and (4) are information processing modules, (5) is an acquisition buffer, (6) is a buffer acquisition request, (7) is a return of the acquisition buffer, (8)
(9) is the transfer of the buffer, and (9) is the release of the buffer.

Next, the operation will be explained. Information processing module (3)
Alternatively, when outputting a buffer acquisition request (6) to the buffer management module (1), the necessary buffer length is presented to the buffer management module (1). The buffer management module (1) allocates the requested amount of buffers from the buffer pool (2) and returns the obtained buffer (5) to the information processing module (3) (7). When a buffer is transferred (8) to a processing module (4) for information exchange, or when the information processing module (4) releases the transferred buffer (9), the released buffer (5) is used for buffer management. Present to module (1). In this way, used buffers and empty buffers are managed.

[Problem to be solved by the invention]

Conventional buffer management systems were configured as described above, so that after transferring the exclusive right to a buffer to another information processing module for information exchange, the information processing module that performed the transfer mistakenly released the buffer and caused other users to If an information processing module loses its exclusive right to a buffer, or if it forgets to release an acquired buffer even after information is exchanged, there is a problem in that it causes a buffer shortage for other information processing modules.

In order to solve the above problems, Japanese Patent Application Laid-Open No. 63-89
"Memory buffer management method" disclosed in Publication No. 949,
The "buffer management method" disclosed in Japanese Patent Application Laid-open No. 62-293450 includes means for recording the buffer usage status or the buffer usage status and buffer contents after a predetermined period of time has elapsed, and measures the effective use of the buffer. Although these disclosures do not disclose countermeasures against abnormal buffer occupancy time and erroneous buffer release.

This invention was made to solve the above-mentioned problems, and it is possible to accidentally release a buffer passed to another module, or forget to release a buffer acquired or received from another module, resulting in a buffer shortage. The purpose is to obtain a buffer management method that prevents such occurrences.

(Means for Solving the Problems) A buffer management method according to the present invention includes a buffer management module that manages acquisition of a buffer used for information exchange between each information processing module from a buffer pool or release to the buffer pool. , means for recording buffer management information such as the identifier of the information processing module that acquired the buffer and the acquired buffer occupation time in the buffer management module, and when the buffer management module searches for a buffer whose occupation time has exceeded, the buffer contents are transferred to the memory. After that, the buffer pool is forcibly released and allocated for low-priority data transfer.

[Operation] The buffer management module according to the present invention records management information such as the identifier of the information processing module that acquired the buffer and the occupancy time of the buffer, and when detecting a buffer whose occupancy time has exceeded the occupancy time by comparing it with the management information. By forcibly releasing the detected buffer to the buffer pool as a bad buffer, and then using it for low-priority information exchange, it can be used effectively instead of being forced to release it to the buffer pool in the car, which would lead to a buffer shortage. Never.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. still,
In the figure, the same reference numerals as in FIG. 3 indicate the same or corresponding parts, and detailed explanation thereof will be omitted. In the figure, (1a) is a buffer management module in this embodiment, and buffer usage/unuse, buffer usage time, and buffer owner are recorded as buffer management items. (3a) is a buffer transfer request to the buffer management module (1a).

Next, the operation of this embodiment will be explained according to the flowcharts shown in FIGS. 2(a) to 2(e). In addition, FIG. 2(a) shows the buffer acquisition processing routine, FIG. 2(b) shows the y<sofa normal release processing routine, FIG. 2(c) shows the buffer sofa abnormal release processing routine, and FIG. 2(d) shows the health level. recovery processing routine,
FIG. 6(e) shows the Ha Sofa transfer processing routine.

First, the information processing module (3) acquires a buffer (
6), the required buffer length is presented to the sofa management module (la). 1<The sofa management module (1a) allocates the requested amount of buffers from the buffer pool (2) (5) and returns the buffers to the information processing module (3) (7). , as shown in Figure 1(a), the buffer management module 'At (la) first attempts to acquire a sofa in the primary buffer of the buffer, and when acquiring the buffer, the sofa management module Set ownership and usage start time using a timer. However, if the primary buffer acquisition fails, try to acquire the secondary buffer (here, the primary buffer is a buffer with a healthy health level). A secondary buffer is a buffer pool whose health level is not healthy (the health level is set to not healthy when a buffer is forcibly released).

When a secondary buffer is allocated, a warning is issued and an error log is recorded. When either a primary buffer or a secondary buffer is allocated, ownership and use start time are set in the buffer management module.

When the information processing module (3) that has acquired the buffer transfers the buffer to the information processing module (4) for information exchange (8), it issues a buffer transfer request (3a) to the buffer management module. At this time, as shown in FIG. 2(C), it is checked whether the ownership of the buffer that issued the transfer request is correct, and if it is correct, the buffer management module that received the buffer transfer request changes the owner of the buffer,
Reset the activation timer. If it is correct, reset the timer and change the ownership; if it is incorrect, record the error log and issue a warning.

When the information processing module (4) releases (9) the transferred buffer, ownership is checked by the buffer management module (1a). At this time, the ownership is checked, and if it is correct, the buffer is normally released to the primary buffer pool (FIG. 2(b)). If it is incorrect, the buffer is not freed, an error log is recorded, and a warning is issued.

During all of the above processes, when the use start timer times out, the buffer management module (la) performs a predetermined process (eg, buffer abnormal release process (FIG. 2(c))). In the buffer abnormality release process, if there is a buffer that is in use and has timed out, it is started every 70 seconds, and if there is a buffer that is in use, the contents of that buffer are deleted from the secondary memory, an error log is created, and the health level is set to an unhealthy state. Connect to the next buffer pool.

In addition, the health level recovery process of the buffer connected to the secondary buffer pool due to the abnormal buffer release process is started every T1 seconds, as shown in Figure 2 (d), and the current active state is monitored by the monitor function. If the buffers connected to the secondary buffer pool are owned by an inactive information processing module, the health level is restored to a healthy state, and the buffers connected to the secondary buffer pool are reconnected to the primary buffer pool. Reset ownership and start time.

In the above embodiment, information processing modules in general have been described, but it is particularly effective in managing buffers used for exchanging information between processing modules forming a seven-layer structure of O5I, for example.

[Effects of the Invention] As described above, according to the present invention, by managing buffer owners and occupancy times, errors caused by buffers with different owners after a buffer transfer operation between information processing modules can be prevented. This has the effect of preventing failures such as the buffer being used up due to forgetting to release the buffer due to the buffer being released and the occupancy time being exceeded.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a buffer management system according to an embodiment of the present invention, FIGS. 2(a) to (e) are flowcharts explaining the operation of this embodiment, and FIG. FIG. 2 is a diagram showing the configuration of a buffer management method. In the figure, (la) is a buffer management module, (2
) is the buffer pool, (3) and (4) are the information processing module, (5) is the acquisition buffer, and (6) is the buffer I.
(6) is a buffer transfer, and (9) is a buffer release. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A buffer management module that manages acquisition of a buffer used for information exchange between each information processing module from a buffer pool or release to the buffer pool, and the buffer management module is provided with an identifier of the information processing module that acquired the buffer and the acquisition buffer. Means for recording buffer management information such as occupancy time, and means for forcibly releasing the contents of the buffer into the buffer pool and allocating it for low priority data transfer after transferring the buffer contents to the memory when the buffer management module searches for a buffer whose occupancy time has exceeded. A buffer management method characterized by comprising: