JPS61255440A - Program interruption control system - Google Patents

Abstract

PURPOSE:To assure a processing result at the time of the control and to improve a processing by saving a program at the time of interrupting the execution of the program to an external memory device, fetching the program into a main memory by an external memory device at the time of the resumption and resuming the program from the interruption time point. CONSTITUTION:When a user program during the execution is interrupted, an interruption processing program of a program interruption processing part 2 is started, the contents of the main memory assigned to the user program are written to an external memory device. When the interrupted user program is resumed, the resumption processing program of a program resumption processing part 3 is resumed. When the resumption processing program is started, the program of the purpose stored at the external memory device is read to a main memory area. At such a time, the stack address and the contents of the stack are set to the condition at the time of interruption.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a program interruption control system, and more particularly to a program interruption and resumption control system in an apparatus that processes data under microprogram control using a microprocessor.

Conventionally, in this type of data processing device, methods for interrupting a user program that is being executed include forcibly terminating the program that is being executed, and restarting the program from the beginning when resuming the program. Alternatively, temporarily release the executing procedure part from the main memory and interrupt the process.
When restarting the process next time, a method was used in which only the procedure part of the user program stored in the external storage device was imported into the main storage device and the process was restarted.

In the above-described conventional interruption control method, in the former case, the processing results up to the middle of execution become invalid, and processing time is wasted. In the latter case, the data portion of the user program being executed remains in the main memory, making it impossible to perform tasks such as turning off the power to the processing device. Another drawback is that there is a possibility that other user programs that require a large amount of main storage space may not be able to be executed.

An object of the present invention is to solve the above-mentioned drawbacks by saving the program to an external storage device when interrupting the user program being executed, and to guarantee the processing results up to the middle of the interrupt. Therefore, it is an object of the present invention to provide a program interruption control method for a data processing device, which makes it possible to improve processing efficiency.

The program interruption control method according to the present invention is capable of controlling the storage contents in the main storage occupied by the user program deployed in the main storage in response to an interruption instruction, and the usage to be executed next. It includes means for reading the address information, stack information, and input/output device control information of the user program, and means for writing the read information into an external storage device, and after the writing is completed, the user program is executed. The feature is that it is forcibly terminated.

Another program interruption control method of the present invention, in addition to the above-described configuration, further includes means for importing the user program written in the external storage device into the main storage device in response to an instruction to restart the user program. and a means for setting the environment of the user program immediately before the interruption based on the address information, stack information, and input/output control information of the user program to be executed next. The feature is that it is possible to resume execution immediately before interruption.

Example Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a schematic block diagram of an embodiment of the present invention, which includes a main storage device 1, a program interruption processing section 2, a program restart processing section 3, an input/output device control section 4, and an input/output terminal device 5.

The input/output terminal 1115 includes, for example, a workstation device, a floppy disk device, a magnetic tape device, a magnetic disk device, etc. as shown in the figure.

FIG. 2 is an example of the operation of a program that controls the interruption process in the program interruption processing section 2 shown in FIG. When the interruption processing program is started, the address and size of the main memory assigned to the user program being executed are determined by referring to the area management information of the main memory (step 10). Find the address of the next instruction to be executed by the user program (step 11) and find the stack information of this user program (step 12)
. Also, check whether the user program is using the input/output device (step 13), and if it is in use, check whether there is any input/output device that has not completed its current input/output operation (step 14).
. If the input/output operation has not finished, it will last until it finishes,
When the process is completed, the control information of the input/output device is taken in (step 15).

When the acquisition of information regarding the user program is completed, an area is secured in the external storage device to record this information (step 16). When the area reservation of the external storage device is completed, the contents of the main memory allocated to the user program are written to the secured external storage device (step 17). Similarly, the address information of the user program command to be executed next (step 18), the control information of the input/output device (step 19), the stack information of the user program (step 20), the main memory management information (step 21) )
is written to the external storage device, and the name of this user program is registered in the index area of the external storage device (step 22) L/
, the user program is terminated (step 23), and the process is terminated.

Next, the operation of the program restart processing unit 3 for the interrupted user program will be explained. FIG. 2 is an example of the operation of a program for controlling restart of an interrupted user program according to the present invention. When the restart processing program starts,
The index of the external storage device is imported (step 24), and it is checked whether the target user program 88 is registered (step 25). If A is registered, the main memory management information written in the external storage device is read (step 26);
Find the size of the main storage area allocated to A, determine whether there is currently free space (step 27), and if there is free space, secure the area in the main memory (step 28)
.

Next, read the stack information of A (step 29), set the stack address and stack contents to the state at the time of interruption (step 30), read the input/output control information (step 31), and turn on the input/output device. If it is in use (step 32), the input/output device is set to the state at the time of interruption (step 33).

As mentioned above, when the environment setting for A is completed, the instruction address information of A is read (step 34), and the contents of A saved in the external storage device at the time of interruption are set in the microprocessor (step 36). Finish the process. When the processing is completed, A is executed from the next instruction at the time of interruption, and the result in the middle of the processing at the time of interruption is guaranteed.

For example, suppose that when a program that requires a long time to process certain data is executed on a data processing device, it becomes necessary to turn off the power to the data processing device when half of the processing has finished. In the conventional method, the program must be forcibly terminated and the power turned off, and then the program must be executed again from the beginning, and the results of the process are not guaranteed.However, with the present invention, the results of the process are not guaranteed. is guaranteed, so processing efficiency can be improved.

Further, the effects of this embodiment will be explained. Now suppose that a situation arises in which emergency program B must be executed while program A is being executed, and it happens that emergency program B requires a large main storage area and cannot be executed simultaneously with program A. In such a case, with the conventional method, the only option was to forcibly terminate A or execute B after A has finished, but with the present invention, A is immediately interrupted and B is executed. It becomes possible.

λ ■ 11 As explained above, according to the present invention, by saving the program to an external storage device when the program execution is interrupted, and importing it into the main memory by the external storage device when restarting the program, the program is restarted from the point of interruption. , it has the effect of guaranteeing the processing results at the time and improving processing efficiency.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of an embodiment of the present invention, FIG. 2 is an operational flow diagram of program interruption processing of an embodiment of the present invention, and FIG. 3 is an operation of program execution restart processing of an embodiment of this invention. It is a flow diagram. Explanation of symbols of main parts 1 Main storage device

Claims (2)

[Claims] (1) A program interruption control method that suspends a user program being executed in a data processing device, the main memory occupied by the user program being deployed in the main storage device in response to an interruption instruction. A means for reading the storage contents in the device, address information of a user program to be executed next, stack information, and input/output device control information, and a means for writing each of the read information to an external storage device. 1. A program interruption control method comprising: forcibly terminating execution of the user program after the writing is completed. (2) A program interruption control method that suspends a user program being executed in a data processing device and restarts the interrupted user program, and is expanded to the main storage in response to an interruption instruction. means for reading the storage contents in the main memory occupied by the user program, address information of the user program to be executed next, stack information, and input/output device control information; means for writing information into an external storage device; means for loading the user program written in the external storage device into the main storage device in response to an instruction to restart the user program; means for setting the environment of the user program immediately before the interruption based on the address information, stack information, and input/output control information of the user program to be executed at A program interruption control method characterized by making it possible to resume execution.