JPH0646093A - Long time storage supervisory system for memory resource - Google Patents

Abstract

PURPOSE:To prevent storage of undesired information by detecting in advance a memory resource release fault being a cause to disable operation of the system. CONSTITUTION:The system is provided with a memory resource P storing tentatively data for a specific purpose and idle/busy bits E indicating the state of reservation of a specific area of the memory resource P for storing data and the state of release of the data storage area after the objective is satisfied, and a long time storage supervisory processing (step 4) employing long time storage supervisory bits K supervising defective release of the memory resource P by storing the state of the idle/busy bits E a first, storing later only the release processing of the reserved area and discriminating the remaining state of the reserved area after lapse of a prescribed time, and when defective release of the memory resource P is in existence, an event of a long time storage supervisory fault is informed (step 5) and countermeasures against the fault are taken.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention operates in a device having a communication line by data such as a communication message generated from the outside to dynamically change a memory resource for each data like an online transaction system and a communication control device. The present invention relates to a long-term reservation monitoring method for a memory resource that monitors whether data in the reserved memory resource is reserved for a long time in a processing system that secures the memory resource in the reserved memory and releases the memory resource that stores the data when the processing ends. .

[0002]

2. Description of the Related Art Conventionally, a free / busy bit has been used as a method for managing memory resources.

Here, the memory resource is, for example, a memory portion in a relay device or a terminal for the host computer, which temporarily stores communication data and the like, and when the processing is completed, transmits it to the host computer to release it. It is a memory. This memory resource is configured by dividing a continuous memory space into blocks of a required size. The empty bit has a plurality of bit numbers corresponding to each block unit of the memory resource.

When data is temporarily stored in a memory resource, that is, when a reservation request is made, a vacancy of a vacancy block bit is searched for, a memory resource area corresponding to the vacancy block bit is reserved, and the vacancy block bit is used. Medium (closed)

Further, at the time of a release request, the free / busy bit of the area to be released is made unused (empty state), and the corresponding area of the memory resource is made writable.

[0006]

By the way, in the above-described long-term suspension monitoring method for memory resources, when a continuous operation for a long time is required, a release request may not be issued for some reason. Then, there may be cases where this release request is not made, but conventionally there is no means to detect this, so the empty block bit in the empty state decreases and memory resources become insufficient, so that the system operation is There is a problem that it may not be possible.

The present invention has been made in view of the above-mentioned problems, and long-term reservation monitoring of memory resources for preventing storage of unnecessary information by detecting a memory resource release failure that causes system inoperability in advance. The purpose is to provide a scheme.

[0008]

The present invention has been made in view of the above problems, and secures a memory resource for temporarily storing data for a specific purpose and a specific area of this memory resource for storing data. And a free / busy bit that indicates the state in which the data storage area has been released by the achievement of the purpose, and stores the initial free / busy bit state, and then only the secure area release process is stored, and after a certain period of time elapses. The present invention is characterized by comprising long-term hold monitoring means for monitoring the release failure of the memory resource by judging the remaining of the reserved area.

[0009]

With the above configuration, when there is a reserved area in the initial empty / closed bit state, the reserved area is sequentially reduced by the release processing. When the reserved area remains until the end after a certain period of time, the area is not released for some reason, and the usable area of memory resources decreases, which impedes the operation of the system. Therefore, the release failure is monitored by the long-term hold monitoring means to prevent the system operation failure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a flow chart showing the processing operation of the long-term reservation monitoring method for memory resources of this embodiment, and FIG. 2 shows changes in the free / busy bit E and long-term reservation monitoring bit K with respect to memory resource reservation and release processing. It is an explanatory view shown. FIG. 3 is a block diagram showing the memory resource P, and FIG. 4 is a configuration of empty / empty bits and a state in which all the empty / inactive bits are released (a state in which all bits are unused (empty: 0)). 3 is a block diagram showing a state in which a specific block portion of a memory resource is secured (a state in which P # 1 is secured and a corresponding empty / busy bit b # 1 is in use (blocked: 1)). FIG. 5 is a block diagram showing the long-term hold monitoring bit, and FIG.
FIG. 1 is an overall configuration diagram of a system adopting a long-term hold monitoring method.

As shown in FIG. 6, the system according to this embodiment includes a CPU 1 for controlling the entire system, a program memory 2 in which a control program is stored, an empty block E and a long-term hold monitor bit K, which will be described later. A data memory 3 for storing data, a transfer data memory 4 as a memory resource P to which data (communication data, programs, etc.) from the outside (host computer, etc.) is transferred, and a communication controller 5 for controlling communication. It is roughly configured. Further, in the program memory 2, the process of FIG.
The programs (A), (B) and (C) are stored therein.

The memory resource P is the same as the conventional memory resource. As shown in FIG. 3, the entire memory resource P is divided into n blocks, and the transfer data from the outside is divided into P # 0 to P # n. It is selectively stored in one of the blocks.

As shown in FIG. 4, the empty / closed bit E is composed of n bits corresponding to the number of blocks of the memory resource P, and when external transfer data is input, this data is stored. An empty block of the memory resource P is selected and secured, and at the same time, the corresponding bit becomes "1",
Display that it is closed.

As shown in FIG. 5, the long-term hold monitoring bit K has the same structure as the empty / closed bit E, and the contents of the empty / closed bit E are copied at the beginning of a "fixed time" described later, and then the memory is stored. Only when the resource P is released, the recorded bit of "1" is rewritten to "0".

Next, the process flow of the long-term hold monitoring method will be described with reference to FIGS. 1 and 2. Note that, here, the block P # of the memory resource P is set by the three programs (B).
The case where 1 is not released will be described as an example.

When external data is input to the system via the communication controller 5, each program (A),
One of the blocks of the memory resource P in which the data is stored is secured by (B) and (C), and at the same time, the corresponding bit of the empty block E for the block of the secured memory resource P is also blocked by "1". ” Then, when the processing based on the external data stored in the specific block of the memory resource P is completed, this data is transferred and the specific block is released. At the same time, the corresponding bit of the empty block E is set to the empty state “0” for the released block of the memory resource P.

In the long-term hold monitoring process, first, the empty block bit E1 (see FIG. 2) is copied to the long-term hold monitoring bit K1 (step 1). At this time, the empty block bits E1 are all empty. Next, a timer is set (step 2), and a certain period of time is waited (step 3).
As the fixed time of this timer, each program (A),
It is desirable that the time is set to be sufficiently longer than the time required from the securing of the memory resource P by (B) and (C) to the release of the secured portion.

At this fixed time, each program (A),
According to (B) and (C), a memory resource P for external data
3 blocks P # 0, P # 1, P # 2 of each of the blocks b # 0, b # 1, b # 2 of the corresponding empty / closed bit E.
Is closed (1) (E2, E3, E4 in FIG. 2).
When the empty block E becomes the closed state "1", the state of the long-term hold monitor bit K does not change.

After a certain period of time, the long-term hold monitoring bit K
Is checked, and it is determined whether or not there is a part in the hold state (closed state “1”) (step 4). If there is no part in the hold state, the process returns to step 1 and the processes up to step 3 are repeated.

Then, each program (A) in FIG.
In the processes up to securing the first memory resource P (state of the empty / closed bit E4) in (B) and (C), there is no portion in the long-term suspension monitoring bit K1 in the suspended state, and all of them are in the idle state. Therefore, the process returns to step 1 to copy the current empty block E (state of E4) to the long-term hold monitoring bit K (K2 in FIG. 2). As a result, the long-term hold monitoring bit K2 is set to the blocks P # 0, P # of the memory resource P.
K # 0, K # 1 and K # 2 corresponding to 1 and P # 2 are in the closed state “1”.

Next, a timer is set (step 2) and a certain time is waited (step 3). During this period, program (A)
At this time, the block P # 0 of the memory resource P is released, and the corresponding part bit b # 0 of the free / busy bit E and the long-term pending monitoring bit K
The corresponding part K # 0 of 2 becomes the empty state “0” (states of E5 and K3). Furthermore, block P in program (C)
# 2 is released, and the corresponding bit b # 2 of the empty block bit E
And the corresponding portion K # 2 of the long-term hold monitoring bit K2 becomes the empty state "0" (states of E6 and K4).

On the other hand, in the program (A), the block P # 3 of the memory resource P is reserved for another data, and the corresponding partial bit b # 3 of the empty block E becomes the blocked state "1" ( E7 state). At this time, there is no change in the state of the long-term hold monitoring bit K.

Here, the program (B) is a memory resource P.
Block P # 1 of the memory block P # 1 has been secured, but stopped for some reason without releasing the memory resource P, and the corresponding bit b # 1 of the empty block E and the bit K # of the long-term pending monitoring bit K
1 is in the reserved state with the closed state "1" (E7
And K4 status).

After a certain period of time has passed, it is judged in step 4 whether or not there is a portion in the hold state. In the long-term hold monitor bit K4, the bit K # 1 remains in the closed state "1". Therefore, it is determined that a long-term hold has occurred. In this case, the fact that a long-term hold monitoring failure has occurred is notified (step 5), and measures are taken against this.

As a result, the empty / closed bit E also records the information of the block P # 3 of the memory resource P secured by the program A immediately before the elapse of a certain time in the monitoring process.
In the long-term hold monitoring bit K, only a portion that is continuously reserved for a certain period of time or more and causes a memory resource release failure can be recorded as a record. The system stop can be surely prevented.

[0027]

As described above in detail, according to the memory resource long-term suspension monitoring method of the present invention, a failure that does not release the memory resource is detected before the system becomes inoperable. The reliability and maintainability of can be improved.

[Brief description of drawings]

FIG. 1 is a flowchart showing a long-term reservation monitoring method for memory resources according to the present invention.

FIG. 2 is an explanatory diagram showing a flow of a long-term hold monitoring method corresponding to FIG.

FIG. 3 is a block diagram showing memory resources.

FIG. 4 is a block diagram showing a structure of free / busy bits, a state in which all the free / busy bits are released, and a state in which a specific block portion of a memory resource is secured.

FIG. 5 is a block diagram showing a long-term hold monitoring bit.

FIG. 6 is an overall configuration diagram of a system in which a long-term hold monitoring method is adopted.

[Explanation of symbols]

 1 CPU 2 Program memory 3 Data memory 4 Transfer data memory 5 Communication controller P Memory resource E Empty block bit K Long-term hold monitoring bit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiichi Nagamori 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (1)

[Claims] 1. A memory resource for temporarily storing data for a specific purpose and a space for displaying a state in which a specific area of this memory resource is reserved for storing data and a state in which the data storage area is released when the purpose is achieved. Has a block bit, stores the initial empty block state, then stores only the reserved area release process, and monitors the release failure of memory resources by determining the remaining reserved area after a certain period of time. A long-term hold monitoring method for memory resources, characterized by comprising long-term hold monitoring means.