JPH04102960A - Multi-cpu control system - Google Patents

Abstract

PURPOSE:To easily decide which service processor includes an error by providing this multi-CPU control system with a means for rewriting information for deciding whether a storage area can be used or not in each sort of a service program to be managed by a management program and a means for monitoring a using state. CONSTITUTION:The multi-CPU control system is provided with the 1st means having a storage area for storing data for determining which part in the storage area at a main storage device 15 can be used and constituted so as to decide whether a service program recently executed by a certain service program is identical with a program requested to be executed at this time or not, the 2nd means for changing data for determining which part of the storage area can be used at the time of deciding that both the programs are different from each other and the 3rd means for detecting invalid information when an illegal storage area is used by the service program. Consequently, which service processor generates an error can be decided.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multi-CPU control system, and particularly to a multi-CPU control system.
The present invention relates to a multi-CPU control method in an operating system of a device in which a main storage device storing management programs for the plurality of CPUs is connected via a bus.

[Conventional technology]

Usually, an operator system has a management program that manages the execution of programs by a plurality of users, and the execution of user programs by a plurality of users is managed under the control of this management program. This type of operating system is equipped with a function to control multiple CPUs that share the same main memory in order to cope with cases where multiple users' program execution requests are crowded and parallel processing jobs are performed. ing.

Traditionally, this type of operating system uses multiple CPUs.
In the control method, each service program of the management control program that would be undesirable to be executed by multiple CPUs is controlled so that only one CPU is executed. As mentioned above, when multiple CPUs share the main memory, the service program running on one CPU must not use any area other than the area it is permitted to use. Even if an unusable area is used due to a mistake when creating the
Conventionally, the management of usability/unavailability for these control programs has not been clearly defined, so there has been no management method such as clearly indicating disapproval information indicating that an unusable area is being used.

Incidentally, while the user is running a user program, the operating system has a program that determines whether the storage area can be used or not for each program, and if the control program receives information that the storage area is not usable, it may cause unauthorized access to the user program. A notification mechanism is in place.

[Problem to be solved by the invention]

The conventional multi-CPU control method described above uses multiple CPUs.
share the main memory, especially the management program, and if an area that cannot be used is accessed due to an error in the input/output device control program, etc. Since the unusable information is not notified, even if a device using an unusable area in the main memory malfunctions, it is difficult to investigate and solve the cause.

An object of the present invention is to provide a control system for a device equipped with multiple CPUs, in which each service program checks the usable/disabled information when accessing the main storage area, and if an error occurs. Multi-CP with a means to issue a fraud notification and switch to a state where it can be maintained.
The purpose of the present invention is to provide a U control method.

[Means to solve the problem]

The multi-CPU control method of the present invention is a multi-CPU control method for an operating system of a device in which a plurality of CPUs, a plurality of input/output devices, and a main storage device storing management program programs for the plurality of CPUs and a plurality of user programs are connected by a bus. In the CPU control method, the main storage device has a storage area for storing data that determines which part of the storage area can be used for each service program making up the management program, and one service program means for determining whether the recently executed service program containing the service program and the service program for which execution has been requested this time are the same; and the first means determines that the two programs are different from each other. The second method is to change the data that determines which part of the storage area can be used in the case, and in the same case, no line is old.The second method is to change the data that determines which part of the storage area can be used. The third part detects unavailability information when the area is used.
means.

〔Example〕

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

FIG. 1 is a system configuration diagram of an embodiment of the present invention, and FIG. 2 is a flow chart explaining the operation of this embodiment.

The multi-CPU device 10 in FIG. 1 is a CPU II.

12, input/output devices 13, 14, main storage device 15, bus 1
6, DSK17, and KBD/CRT18.

In FIG. 1, a CPU II, 12 is connected to input/output devices 13, 14 and a main storage device 15 via a bus 16. Input/output devices 13 and 14 are DSK17 and KB, respectively.
Connected to D/CRT 18, each input/output device 13.14
Control is performed directly from the The CPU II 12 executes a management program and a user program, and the main storage device 15 stores the management program and user program of the CPU II 12 and various takes.

Next, the operation of this embodiment will be explained with reference to the flowchart of FIG.

Note that this flow chart shows the operating procedure of, for example, the management program of the CPU II while either the CPU II or 12 is executing a user program. When a certain user program makes a service request during execution of a user program (step 21), the management program detects the request (step 22). If YES indicates detection, check whether the requested service is already being executed on another CPU 12.7. Step 23), if it is already running,
The requested user program is suspended (step 24), and the CPU II moves on to executing the user program of the next waiting service request (step 25). Returning to step 23, if the requested service has not yet been executed on either CPU (No), the management program checks whether the user program is the same as the service program most recently executed on the currently active CPU. (step 26). To supplement the explanation of step 26, the CPU II checks whether the service program that was previously called from the main storage device 15 to the processing memory at the request of a certain user program is the same as the currently requested service program. .

Therefore, if the result is YES, the management program issues a command to execute the service (step 28).

If NO, it cannot be used, so information indicating that it is not allowed is output. Therefore, although not shown, the procedure is to call another appropriate service program from the main storage device 15 to the processing memory and rewrite the usability/disability information applied to that service program (step 27). Then, the service starts running (step 28) and ends if there is no problem with the user program execution (step 27).
.

During the service program, we constantly monitor whether access to this area is unauthorized based on the usable/disabled information, and if access is found to be unauthorized (step 30), we notify the user that unauthorized access has occurred and stop the service (step 30). 31). Here, the procedure of the management program is to suspend other programs that are currently being executed (step 32).
Then, the maintenance personnel replaces the invalid service program with the correct one (step 33), and restarts the service program (step 34).

〔Effect of the invention〕

As explained above, the present invention rewrites information for determining whether a storage area can be used or not for each type of service program for a user program managed by a management program in a control program of an operating system consisting of multiple CPUs. By having the means and the means to monitor that usage is fair,
Even if there is a mistake in a service program of an operating system, the effect is eliminated on programs that perform unrelated services, and it is possible to easily determine which service program contains the mistake.

[Brief explanation of drawings]

Figure 1 shows an embodiment of the present invention and a conventional multi-CPU.
FIG. 2, a block diagram common to the control method, is a flowchart of one embodiment of the present invention. 10...Multi CPU device, 11.12...
... CPU, 13.14 ... Input/output device, 15
...Main storage device, 16 ... Bus, 17
...DSK, 18...K B D /
CRT 0 Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] 1. A plurality of CPUs, a plurality of input/output devices, and the plurality of C
In a multi-CPU control method in an operating system of a device in which a PU management program and a main memory storing a plurality of user programs are connected by a bus, the main memory is configured to control each service program constituting the management program. A service program has a storage area that stores data that determines which part of the storage area can be used, and the service program that one service program has recently executed including the previous one is the same as the service program that has been requested to execute this time. a first means for determining whether the two programs are different, and a data change for determining which part of the storage area can be used when the first means determines that the two programs are different; is characterized in that it has a second means in which nothing is done, and a third means for detecting inappropriate information when an illegal storage area is used by a service program in a management program during the user program execution stage. Multi-CPU control method. 2. The multi-CPU control system according to claim 1, wherein the third means suspends the service to the user when detecting the disable information, and resumes the service after modifying the service program.