JPH035856A - Monitoring system for memory content holding function - Google Patents

Abstract

PURPOSE:To prevent a memory content from coming to an illegal value owing to a secondary malfunction by periodically monitoring the malfunction of a memory content holding function and stopping an operating system and the action of an application program when malfunction is detected. CONSTITUTION:The operating system 1 is stored on a memory 7 with memory content holding function in the same way as the application program 8. When a memory content holding function monitor processing part 3 in the operating system 1 periodically monitors the memory content holding function and detects that the memory content changes to the illegal value owing to the malfunction of the memory content holding function, it instantaneously interrupts the processing. Thus, that the memory content changes to the illegal value by secondary malfunction can be restricted to a minimum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to software for a terminal that has a memory content retention function but does not have a memory parity check function.

[Conventional technology]

Conventionally, in terminals that have a memory content retention function but do not have a memory parity check function, when a malfunction of the memory content retention function occurs and the memory content changes to an invalid value, If the instruction section of the operating system or application program was stored in the memory section that was used, the operating system or application program would malfunction.

[Problem to be solved by the invention]

As described above, in the conventional method, malfunction of the memory content retention function is the primary cause, and secondary malfunction of the operating system or application program may cause the memory content to become a new invalid value.

The present invention eliminates such drawbacks by regularly monitoring malfunctions of the memory content retention function, and stopping the operation of the operating system and application programs when a malfunction is detected, thereby preventing the above-mentioned secondary It is possible to prevent memory contents from becoming invalid values due to malfunction.

[Means to solve the problem]

The configuration of the memory content retention function monitoring method of the present invention is such that a memory content retention function monitoring processing unit and a memory content retention function monitoring processing unit are installed in the operating system of a terminal that has a memory content retention function but does not have a memory parity check function. The operating system periodically monitors the memory content retention function by the memory content retention function monitoring processing unit while the terminal is in operation, and detects whether the memory content is an invalid value due to a malfunction of the memory content retention function. It is characterized by detecting a change in .

〔Example〕

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

FIG. 1 is a block diagram of an embodiment of the present invention, in which 1 is an operating system, 2 is a memory content retention function monitoring information area, 3 is a memory content retention function monitoring processing section, 4 is an initial setting processing section, and 5 is a block diagram of an embodiment of the present invention. Reference numeral 6 indicates a start-up monitoring processing section, 6 indicates a regular monitoring processing section, 7 indicates a memory with a memory content retention function, and 8 indicates an application program.

For convenience of explanation of the embodiment, the memory 7 with a memory content retention function and the operating system 1 are shown separately in the figure, but in reality, the operating system 1 is stored in the memory 7 with a memory content retention function in the same way as the application program 8. has been done.

As the first process, in the memory 7 with memory content retention function,
When storing the operating system 1 and application programs 8, the initial setting processing unit 4 performs processing to determine the starting position and length of the instruction portion of the operating system 1 and the application program 8 in the memory 7 with a memory content retention function. and its BCC (B
lock check code) value is calculated and stored in the memory content retention function monitoring information area 2.

As a second process, when the first process has already been completed, the startup waiting monitoring processing unit 5 performs the process immediately after the terminal is powered on, and the operating system 1 stored in the memory 7 with a memory content retention function is processed. and the application program 8, the BCC value is calculated based on the start position in the memory with memory content retention function 7 stored in the memory content retention function monitoring information area 2 and the length of the instruction section. This calculated value is compared with the BCC value stored in the memory content retention function monitoring information area 2 during the above-described first operation. If they match, it is determined that the memory content retention function is operating normally, and processing continues. If they do not match, it is determined that the memory content retention function has malfunctioned and the memory content has changed to an invalid value, and the process is immediately interrupted. If a display device or a printing device is connected to the terminal, the operator is notified of this through display or printing.

As a third process, when the terminal is already powered on and operating, the periodic monitoring processing unit 6 performs a process at a certain fixed time interval, and performs the same process as the second process described above.

〔Effect of the invention〕

As described above, the present invention has the effect of minimizing changes in memory contents to invalid values by preventing secondary malfunctions due to malfunctions of the memory content holding function.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Operating system, 2... Memory content retention function monitoring information area, 3... Memory content retention function monitoring processing section, 4... Initial setting processing section, 5... Startup waiting monitoring processing section, 6... Regular monitoring processing section, 7... Memory with memory content retention function, 8... Application program.

Claims (1)

[Claims] The operating system of a terminal that has a memory content retention function but does not have a memory parity check function is provided with a memory content retention function monitoring processing unit and a memory content retention function monitoring information area, and the The operating system periodically monitors the memory content retention function by the memory content retention function monitoring processing unit,
A method for monitoring a memory content retention function, characterized in that it detects that the memory content has changed to an invalid value due to a malfunction of the memory content retention function.