JPH01246637A - Exception recovery processing control system - Google Patents

Abstract

PURPOSE:To stop the execution of wrong exception recovery processing in case of destruction of control information by using normal control information at the time of obtaining this control information to execute the exception recovery processing. CONSTITUTION:Each time a control information processing means 2 receives change information (a) of the processing state and control information from a program 1 executed at present, the means 2 reads out stored control information (b) with a control pattern from a control information storage means 3 and changes this control information by change information (a). Simultaneously, control information resulting from this change is divided into plural parts and specific control patterns are added to respective parts, and control information (b) with a control pattern is stored in the control information storage means 3 again. An exception recovery processing means 4 is started by an exception occurrence report (c) to start a prescribed recovery processing and sends a control information read request (d) to a control information reading means 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exception recovery processing control method, and particularly to an exception recovery processing control method that performs exception recovery processing using stored control information.

[Conventional technology]

Conventional exception recovery processing control methods that perform exception recovery processing using control information stored in a control information storage means are activated by an exception occurrence notification when an exception occurs for some reason during program execution. The exception recovery process is executed by starting a predetermined exception recovery process, reading out the control information stored in the control information storage means, and using it unconditionally.

[Problem to be solved by the invention]

The conventional exception recovery processing control method described above performs exception recovery processing by reading the control information stored in the control information storage means and using it unconditionally. Therefore, when the control information is destroyed, unauthorized It has the disadvantage that it may malfunction due to execution of exception recovery processing.

An object of the present invention is to provide an exception recovery processing control method that can execute exception recovery processing using control information only when normal control information is obtained.

[Means to solve the problem]

The exception recovery processing control method of the present invention includes: (A) a control information storage unit that stores control information such as a processing state regarding a program being executed and system resources acquired by the program; each time a change is requested, reading the control information from the control information storage means and changing it;
control information processing means that divides the control information into a plurality of parts, adds a specific control pattern to each part, and stores the control information in the control information storage means; (C) the control information is processed by the control information read request; The control information to which the control pattern has been added is read out from the information storage means, the control pattern is inspected, and if it is correct, the read control information is determined to be normal control information and provided, and the control pattern is inspected. When the control information is incorrect, the control information reading means determines that the control information may have been destroyed and provides a destruction possibility recognition notification. When the normal control information is obtained by starting a predetermined exception recovery process when activated by the notification and sending the read request to the control information reading means, the normal control information is used. and an exception recovery processing means for executing an exception recovery process and, when receiving the destruction possibility recognition notification, canceling the exception recovery process using the control information.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the exception recovery processing control method of the present invention.

As shown in FIG. 1, each time the control information processing means 2 receives change information a about the processing status of the program 1 and control information such as system resources acquired by the program 1 from the program 1 being executed, the control information processing means 2 The control information with control pattern stored in the information storage means 3 is read out, the control information is changed with the change information a, the control information as a result of the change is divided into a plurality of parts, and the front and back of each part are changed. By adding a specific control pattern to
The control information storage means 3 stores the control information with the control pattern again.
Send it to and memorize it.

Furthermore, when an exception occurs for some reason during the execution of the program 1, the exception recovery processing means 4 is activated by the exception occurrence notification C, starts a predetermined exception recovery process, and sends the control information reading means 5 to the control information reading means 5. Send control information read request d.

For this reason, the control information reading means 5 reads out the control information with a control pattern from the control information storage means 3 in response to the control information reading request d, checks the control pattern, and if the control pattern is correct, the read control information is normally controlled. The control pattern is determined to be information e and provided to the exception recovery processing means 4, and when the control pattern is inspected and found to be incorrect, a destruction possibility recognition notification f is sent to the exception recovery processing means 4, indicating that the control information may have been destroyed. provide.

As a result, when the normal control information e is obtained, the exception recovery processing means 4 executes the exception recovery process using the normal control information e, and when receiving the destruction possibility recognition notification f. , the exception recovery process that uses the control information will be canceled.

As described above, in the exception recovery processing control method of this embodiment, when normal control information is obtained, the exception recovery processing can be executed using that control information, and the control information is not destroyed. When the error occurs, execution of the illegal exception recovery process can be stopped.

〔Effect of the invention〕

As explained above, in the exception recovery processing control method of the present invention, when normal control information is obtained, the exception recovery processing can be executed using the control information, and the control information is not destroyed. This has the effect that execution of the illegal exception recovery process can be stopped when the error occurs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the exception recovery processing control method of the present invention. ■...Program, 2...Control information processing means, 3...Control information storage means, 4...
... Exception recovery processing means, 5 ... Control information reading means, a ... Change information, B ... Control information with control pattern, C ... Exception Occurrence notification, d
...Read request, e...Normal control information, f...Destruction possibility recognition notification.

Claims (1)

[Scope of Claims] (A) Control information storage means for storing control information such as the processing status of a program being executed and system resources acquired by the program; (B) When a change in the control information is requested from the program; Each time the control information is read out and changed from the control information storage means, the control information is divided into a plurality of parts, a specific control pattern is added to each part, and the control information is stored in the control information storage means. (C) In response to a read request for the control information, the control information to which the control pattern has been added is read out from the control information storage means, and when the control pattern is inspected and is correct, the read control information is stored. control information reading means for determining and providing control information as normal control information, inspecting the control pattern and, if the control pattern is incorrect, providing a destruction possibility recognition notification indicating that the control information may have been destroyed; (D) When an exception occurs for some reason during the execution of the program, it is activated by an exception occurrence notification, starts a predetermined exception recovery process, and sends the read request to the control information read means. , when the normal control information is obtained, the normal control information is used to execute an exception recovery process, and when the destruction possibility recognition notification is received, the exception recovery process is performed using the control information. An exception recovery processing control method comprising: exception recovery processing means for canceling processing.