JPH08263296A - System for preserving and restoring program execution environment - Google Patents

Abstract

PURPOSE: To unnecessitate the individual preservation and restoration of an environmental variable necessary after reponing a program on the side of a program by restoring the environmental variable saved and preserved in an environmental variable saving and preserving part. CONSTITUTION: This computer system is provided with an operating system 2 executing a prescribed processing based on a program in a program preserving part 1. The computer system is provided with an environmental variable storage part 3 storing an enviromental variable specifying the execution environment of the program, a processing program storage part 4 storing plural kinds of processing programs, and a processing selection device 5 selecting a processing program based on the specified enviromental variable to make the operating system 2 execute. In addition, the computer system is provided with an environmental variable saving and preserving part 6 for saving and preserving the environmental variable, and environmental variable saving device 7 saving the environmental variable housed in the environmental variable storage part 3, and an environmental variable restoring device 8 restoring the saved and preserved environmental variable in the environmental variable storage part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for saving and restoring a program execution environment in a computer system, and more particularly to a program for saving and restoring environment variables provided by an operating system of unix (product name). Execution environment save and restore system.

[0002]

2. Description of the Related Art In a conventional program execution environment saving / restoring system, the contents of environment variables are erased when the program or system abnormally ends, and the interrupted part is stored when the program abnormally ends during execution. There is no mechanism to keep it in a standard operating system. In addition, although it is not a standard function, the program execution environment save / restore system, which has extended functions such as checkpoint and restart, either explicitly specifies the point at which the execution environment is saved in the code of the program, or
A function that saves the execution environment by dynamically specifying a save point by the operator's save execution environment command during program execution, restores the execution environment at the time of re-execution, and restarts execution from the specified point. Is provided.

[0003]

However, in the conventional environment variable saving / restoring system, when the suspended program is restarted, the environment variables required after the restart are saved / restored on the program side. There is a problem in that a save and restore system must be implemented separately for each.

Further, in the conventional environment variable saving / restoring system, when the program is abnormally terminated during execution, in order to store the saved portion, a code for storing the execution location must be embedded in the code of the program. There is a problem that it must be.

Further, in the conventional environment variable saving / restoring system, even if the checkpoint and restart functions are used, the code must be rewritten in order to specify the savepoint in the code of the program. Also, even if you specify a save point dynamically by using a save command, the save point is the part that happened to be executed when the command was entered, regardless of the logic of the program. It is impossible to restore without saving, and it is impossible to save completely in practical cases.

An object of the present invention is to provide a program execution environment saving / restoring system in which, when a suspended program is restarted, it is not necessary for the program to save and restore the environment variables required after the restart. Especially.

Another object of the present invention is to automatically save the execution environment when the set value of a specific environment variable is changed, so that it is not necessary to newly set a save point in the code of the program. It is to provide a program execution environment save and restore system.

Still another object of the present invention is that the environment variables to be set can be limited to those necessary for restoration, so that the operating system for saving can be easily implemented and saving and saving It is to provide a program execution environment save / restoration system in which a programmer can control a restoration method.

[0009]

In order to solve the above problems, the present invention provides a program storage unit for storing a program, and an operating system for executing a predetermined process based on the program in the program storage unit. In a computer system including: an environment variable storage unit that stores environment variables that specify an execution environment of the program; a processing program storage unit that stores a plurality of types of processing programs; and the processing program specified by the program. A processing selection device for selecting one of the processing programs stored in the processing program storage section based on an environment variable stored in the environment variable storage section and causing the operating system to execute the selected processing program;
Environment variable save and save unit for saving and saving environment variables,
An environment variable saving device that saves environment variables stored in the environment variable storage unit to the environment variable saving storage unit, and restores environment variables saved in the environment variable saving storage unit to the environment variable storage unit And an environment variable restoration device for performing the same.

[0010]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of a program execution environment storage system of the present invention. First
The program execution environment storage system as an example of
In a computer system including a program storage unit 1 that stores a program and an operating system 2 that executes a predetermined process based on the program of the program storage unit 1, an environment variable that specifies an execution environment of the program is set. The stored environment variable storage unit 3, the processing program storage unit 4 storing a plurality of types of processing programs, and the processing program storage unit based on the environment variables of the environment variable storage unit 3 designated by the program. Processing selection device 5 that causes the operating system 2 to execute any one of the processing programs 4
An environment variable save unit 6 for saving and saving environment variables; an environment variable save device 7 for saving environment variables stored in the environment variable storage unit 3 in the environment variable save unit 6; The environment variable restoring device 8 restores the environment variables saved and saved in the environment variable saving unit 6 to the environment variable storing unit 3.

The environment variable storage unit 3 and the processing program storage unit 4 are set in the primary storage device 9. The environment variable save / save unit 6 is set in the secondary storage device 10.

FIG. 2 is a block diagram showing a second embodiment of the program execution environment restoration system of the present invention. The program execution environment restoration system as the second embodiment is the same as the first embodiment of FIG. 1, except that the program execution at the time point when the program issues a setting request to a specific environment variable and returns to the program. An execution information storage device 11 that sets information in a special environment variable of the program and saves it in the environment variable storage unit 6, and restores and saves the environment variable when the program is re-executed after abnormal termination of the computer system A program restart device 12 that reads all the environment variables of the unit 6 and restores them in the environment variable storage unit 3 and at the same time selects the special environment variable and restarts the execution of the processing program corresponding to the environment variable 12.
Have and.

The program restarting device 12 comprises a restarting device 13 and a restoration complement processing device 14. The execution information storage device 11 is connected to the operating system 2 and the environment variable storage unit 3. The restarting device 13 is connected to the operating system 2 and the environment variable restoring device 8. The restoration complement processing device 14 is connected to the program storage unit 1, the process selection device 5, and the restart device 13. The restarting device 13 reads all the environment variables in the environment variable restoring and saving unit 6 and restores them in the environment variable storing unit 3 at the time of requesting re-execution of the program after abnormal termination of the computer system. The restoration complement processing device 14 stores execution information for selecting the special environment variable and restarting the execution of the processing program corresponding to the environment variable.
Give to. The restoration complement processing device 14 generates a restoration complement processing signal that specifies a re-execution point from which point in the processing program to re-execute based on the execution information, and supplies the restoration complement processing signal to the program storage unit 1 and A program selection signal is given to the process selection device 5.

In the embodiment of FIG. 2, when the program sets a set value (for example, "-1") of the environment variable in the environment variable storage unit 3, a process to be executed depending on the set value. Is selected by the process selection device 5. In this process, the operating system 2 saves execution information for setting the program execution information at the time when the program issues a setting request to the environment variable and returns to the program in a special environment variable of the program in the environment variable storage unit 3. This is a process of sequentially executing a process and a process of saving all environment variables in the environment variable saving and saving unit 6.

Next, at the time of requesting re-execution of the program after abnormal termination of the computer system, the environment variable restoring device 8 reads all the environment variables of the environment variable saving and saving unit 6 to restore the contents, and from the save point. A program restart unit for re-executing the program is executed.

At the beginning of the program after the restart, that is, as the post-processing of the environment variable setting request, the program restores the execution-environment restoration complement processing that can be resumed as the logic of the program based on the restored environment variables. The complement processing device 14 uses the process selection device 5.

[0018]

According to the present invention, when the suspended program is restarted, it is not necessary for the program to independently save and restore the environment variables required after the restart. Also,
According to the present invention, the saving of the execution environment is automatically executed when the set value of the specific environment variable is changed, so that it is not necessary to newly set the save point in the code of the program.

Further, according to the present invention, unlike the dynamic setting by the checkpoint and restart commands,
Since the save point is specified when the setting value of the environment variable is changed, it becomes possible to assist the restoration of the execution environment as the logic of the program, and it is not necessary to save the execution environment completely. Since the items to be set as are limited to those necessary for restoration, the implementation of the operating system for saving becomes simple, and the programmer can control the saving and restoring method.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Program Storage 2 Operating System 3 Environment Variable Storage 4 Processing Program Storage 5 Process Selector 6 Environment Variable Saving / Saving 7 Environment Variable Saving 8 Environment Variable Restoring 9 Primary Storage 10 Secondary Storage 11 Execution Information Storage Device 12 Program restart device 13 Restart device 14 Restoration complement processing device

Claims (2)

[Claims] 1. A computer system comprising: a program storage unit storing a program; and an operating system for executing a predetermined process based on the program stored in the program storage unit, an environment for designating an execution environment of the program. An environment variable storage unit that stores variables, a processing program storage unit that stores a plurality of types of processing programs, and a processing program storage unit based on the environment variables of the environment variable storage unit designated by the program. A processing selection device for selecting one of the processing programs and causing the operating system to execute the program;
Environment variable save and save unit for saving and saving environment variables,
An environment variable saving device that saves environment variables stored in the environment variable storage unit to the environment variable saving storage unit, and restores environment variables saved in the environment variable saving storage unit to the environment variable storage unit A program execution environment saving / restoring system, comprising: 2. The program execution environment save / restoration system according to claim 1, wherein the program execution information at the time of returning to the program when a request for setting a specific environment variable is issued from the program The execution information storage device that sets the environment variables to the environment variable storage unit and stores the environment variables in the environment variable restoration device at the time of re-execution request of the program after abnormal termination of the computer system. And a program resuming means for resuming execution of the processing program corresponding to the environment variable by selecting the special environment variable at the same time as reading and restoring the environment variable storage unit. .